Economic Valuation for Cultural and Passive Ecosystem Services Using a Stated Preference (Contingent Valuation Method (CVM)) Case of the Elgeyo Watershed Ecosystem, Kenya

Valuation of ecosystem services (ESs) can be typical as use values and passive use values. However, the prevailing conventional markets provide economic instruments such as price tags to ecosystem use values, but rarely on passive use values. (is is limited since it does not provide comprehensive ecological values that will adequately support rational decision-making processes regarding ecological conservation. (e study adopted the contingency valuation method (CVM) where three hundred and eighty households of communities living within the Elgeyo watershed were sampled. (e findings recorded 97% of the population was willing to pay for the ESs quoted. Individual maximum WTP ranged between 1 USD and 57.1 USD (cultural), 1 USD and 95.2 USD (bequest), and 1 USD and 76.2 USD (biodiversity conservation). (e overall mean maximum WTP was 7.4± 0.34 USD, 9.1± 0.49 USD, and 11.1± 0.68 USD for the cultural, bequest, and biodiversity, respectively. (e multivariate regression (maximum WTP as a function of administrative location, education, income, sex, age, and livestock number) exhibited a significant difference regardless of multivariate criteria used, where Wilks’ lambda has F (75,203)� 4.03, p< 0.001. (e findings provide an economic value for nonuse values that can be incorporated in total economic valuation (TEV) studies locally as well as provide an impetus on payment of ecosystem services (PES) in Kenya.


Background
Ecosystem services (ESs) are direct and indirect benefits that the nature provides to the society, fundamental to human welfare, with genuine economic development, which people value [1][2][3][4][5][6]. System Environmental-Economic Accounting (SEEA) explicitly demonstrates the linkages between ESs with the economy and human livelihood program and how human development programs affect the stock and flow of ES in the future [7]. However, though the society depends on the nature for its survival and development, its economic value is invisible in policy and decision-making processes. Benefit and the subsequent degradation cost of our ecosystems have, in many instances, gone largely unnoticed [8]. Valuation of ESs becomes essentially important to not only account for the benefit acquired from the nature but also express and report in monetary terms the impact and cost of degrading our ecosystems and biodiversity [9]. Furthermore, the valuation of the ecosystem and biodiversity is a prerequisite for the establishment of a market-based mechanism such as payment of ecosystem services to reward conservation efforts and promote the enhanced flow of ESs [10]. Taking cognizance of the nature and benefits provided would be regarded as step one, but an estimation of ES worthiness more so in monetary terms would be more persuasive in decision making and, thus, encourage the incorporation of the same in their decisions [9,11]. e total economic valuation (TEV) framework has broadly grouped ESs as "use" and "nonuse/passive" values [4,8]. Assessment and measurement of ESs could be undertaken using various metrics that can either be nonmonetary and nonnumerical or numerical and monetary. All these are dependent on the services or goods being quantified, time, resources available, and the significance of the valuation study on a decision to be undertaken. Valuation of ESs, particularly in monetary terms, is complex, and in most cases, a small subset of ecosystem and biodiversity services is available in our conventional markets and where necessary "priced" [5]. Commonly, "use values" have market prices and, thus, it is simpler to attach a monetary value while "nonuse values/passive use values" have no market "price" primarily because of their public goods and service nature [12,13] and are, thus, more complex to ascribe a monetary unit. e prevailing scenario is limited since it does not provide comprehensive ecological values that will adequately support rational decision-making processes in regards to biological conservation in its entirety. at notwithstanding, conventional techniques and tools have been developed and adopted in valuation including nonuse/passive use services that are largely categorized as revealed and stated preference. Albeit substantial criticism on their robustness, they are conventionally applied while bearing shortcomings as pointed out. Fundamentally, on the hypothesis that the monetary values of these services are contingent on societal preference, choices, and tradeoffs, overall, valuation of these services is aimed at unravelling the complex socioeconomic and ecological linkages to influence sound decision making as the society envisages a genuine development progress. More so, as the society advances, incentivization of ecosystem and biodiversity conservation and its incorporation in projects and policy appraisals is carried out. e economic valuation of ESs is rapidly developing as the main logical mechanism available to support rational decision making on the conservation of nature [14,15]. Appreciating, accounting, and expressing, in a monetary unit, the value of ES is essential in advancing a new policy direction, particularly on conservation and management of nature [9]. e valuation concept is meant to provide information on the economic status of natural resources and provide the cost of degradation both at the local and international development discourse that would otherwise make an irrational decision on biodiversity conservation [5].
is is also aimed at accounting and reporting the monetary impact of ecosystem and biodiversity changes that would primarily not be reported in conventional markets and particularly those not connected to human social welfare [16]. Enhanced ecosystem conservation would translate to improved and continuous provision of ecosystem services and, thus, enhanced human well-being.
Passive use values are ecosystem goods and services that the society attaches to ecological systems not necessarily connected to current or future beneficiaries, rather intrinsic values of nature existence [17][18][19].
ey have been the subject of the evolving economic literature since the mid-20 th century when the society started discussing the importance of existence and aesthetic values to nature conservation [20]. Different terminologies have been utilized to define these services; however, in recent years, these values have been defined in the context of existence and bequest values to underscore the utilitarian dimension of such ecosystem values in economics [21,22]. at notwithstanding, these values provide fundamental and most convincing incentives, particularly for conservation of nature and biological diversity [20,23] more so locally (Kenya).
It is worth noting not all ESs are readily traded in conventional markets and, thus, complexity in the apportionment of monetary units [24]. ere are, however, applicable conventional nonmarket valuation techniques that are used to apportion value to passive use values. ese include stated preference (contingent valuation model (CVM), discrete choice experiment model, and conjoint valuation) and revealed preference (travel cost method (TC)); time cost method; and hedonic pricing method (HPM)) [25]. e monetary unit for passive or nonuse values is defined and measured on the pretext of willingness to pay (WTP) within the framework of neoclassical economics [20]. Despite reporting substantial shortcomings, stated preference has been the most common valuation technique used for attaching economic value to nonuse values [20,[26][27][28]. Similarly, the CVM has shown to be relatively straightforward since it does not require an explicit relationship between nonmarketed goods and product market prices [20]. All it requires is setting up a hypothetical scenario and presenting the same to the targeted respondent and subsequently elicit maximum willingness to pay that represents the economic values of the quoted ecosystem service indirectly [29]. According to the work in [20], the mean minimum economic value for nonuse resources using the choice experiment model ranges between 25 and 40% less than the common mean WTP reported. e CVM is used as a market-based instrument to compute the maximum mean WTP in exchange of either to enhance ecosystem public goods and service or fund payment "vehicle" schemes more so for nonuse values as it seeks to express changes in utility in monetary terms [30,31].
e Elgeyo Hills watershed prides with exceptional resources ranging from pristine sceneries; unique biodiversity; geology; and mineral resources to favourable climate among others. e ecosystem provides ecosystem goods and services such as freshwater, food production, beautiful sceneries, and sociocultural site among others. Although the ecosystem is critical both locally and internationally, it is, however, under immense pressure from anthropogenic drivers essentially from other competing land uses and programs. is has led to massive degradation and decline in the state of resources over the past years leading to reduced stock and flow of ecosystem goods and services.
is is projected to impact negatively on community well-being and the national economy soon. e ecosystem is also part of Lake Turkana and Victoria subbasins, and thus, continued degradation would pose a negative consequence on the sustenance of these critical lakes and, thus, not able to provide and sustain the growing human socioeconomic development agenda in the region [32].

Study Area.
e Elgeyo watershed is one of the proposed water towers in the country and traverses two counties though largely on Elgeyo Marakwet County with a small section on  [33]. e gazetted forest includes Kaptagat (5663.6 ha), Sabor (4047 ha), Kipkabus (6503.6 ha), Penon (3220 ha), and Kessup (2647 ha) (Figure 1). e watershed falls within three major agroecological zones, high-altitude region, and moorland; escarpment and valley; and lowland. e ecosystem has a relatively cool climate with varied rainfall levels across the various agroecological zones. e average rainfall is 700 mm in the semiarid Kerio Valley and 1700 mm in the highlands. e rainy season is between March and September with a maximum recorded in May and August and a minimum in January. Seasonal variation increases in the more arid areas of the valley and reliability decrease. Temperatures in the valley record as high as 33°C more so in the lower altitude areas. e annual evapotranspiration rate is approximated at 1985.09 mm. e altitude varies from 900 m above sea level in the Kerio Valley to over 3350 m above sea level in the highlands which gives rise to considerable differences in climatic conditions. e slope varies from 2% in the valleys to 37% in the hills [34].
Elgeyo Marakwet County has a population of 454,480 (227,317 male and 227,151 female), 99,119 households with an intercensus population rate of 2.7%. Keiyo South Constituency is the most populous one with a total of 120,750 and Marakwet East has the least with 97,041, while Keiyo North has a population of 99,176 and Ainabukoi and Moiben in Uasin-Gishu have a population of 138,184 and 181,338, respectively. Elgeyo Marakwet County has an average population density of 150 persons per square kilometer while Uasin-Gishu has a density of 342 persons per square kilometer [35]. e labour force (15-64 years age bracket) accounts for 49.7 percent of the total population [34,36].

Survey Design and Data Handling.
e study adopted a cross-sectional approach where the interviews for the sampled population were carried at one point in time between December 2020 and January 2021 through administration of structured questionnaires. Stratified sampling was employed where the study area was divided into the smallest administrative units (sublocation) as the enumeration area (EA). A fraction was generated based on the population of the enumeration area divided by the total population. is was used to populate the primary sample unit after multiplying with a total sample size of 384 generated by Mugenda and Mugenda [37]. is stratified sampling design was preferred to others since it offered a better opportunity not only for the overall population but also individuals at the smallest sample had a chance of being represented in the survey.
e study elicited the willingness to pay from a sample of households living around the Elgeyo watershed whereby it first sought authority from local state institutions, local administration, and community before commencement with primary data collection. e local elders were also consulted who ultimately supported both in guiding the research team and providing indigenous knowledge during the entire study period. e design on the contingent valuation method (CVM) questionnaire was a single-bound dichotomous choice where the maximum willingness to pay was elicited through either yes or no question. Similarly, inquiry on household socioeconomic characteristics hypothesized to influence the maximum bid value by the target population was incorporated in the questionnaire. ey included respondent age, sex, education, income, the distance to the ecosystem, land size, household size, and household leadership characteristics among others. e questionnaire was pretested together with all the research assistance before the actual survey. e questionnaire had four parts: firstly, provoking environmental conservation conscience on the benefit accrued from the ecosystem and narrowing to nonuse ESs (cultural/spiritual values, bequest, and biodiversity conservation) as quoted, secondly the hypothesis of enhanced services' stock and flow after undertaking some policy action and demonstrating the contrary on maintenance of status, then the single dichotomous question on whether they agree with the status of the benefit demonstrated with both the scenarios, and lastly, the proposed bid from which the respondents were to choose from, in this case, between 1 USD and 95.2 USD. e bid range was adopted from the commonly used WTP values reported to range from 1 to 200 USD, one being the minimal and two hundred being the highest [38]. Eleven (KES 100, 500, 1000, 1500, 2000, 3000, 4000, 5000, 6000, 8000, and 10,000) bid options provided wide range the respondents were to choose from. is provided a range to obtain the mean lowest as well as the highest bid for the services quoted [39].
e study considered every bid stated by the respondent; however, zero values were considered invalid if reported as a protest. e protest, in this case, is where the respondent perceives the value is zero since it is not "their" role to conserve either on the basis that it is the government's responsibility or lack of trust in institutions vested with the management of the proposed scheme. Furthermore, individuals who did not understand the concept were also excluded from the survey.
Overall, the study intended to first establish the mean estimate WTP for local communities living around the watershed and, secondly, compare the mean value across the various factors hypothesized to influence the actual economic value stated. e data regenerated were both quantitative and qualitative, thus necessitating the use of descriptive statistics and correlative and comparative analysis where a mix of linear and nonlinear regression was utilized.

Household Sample.
e study sampled 380 households from the population living around the watershed. e distribution was based on the proportion of primary sample point areas (administrative units). e sampled household was spread across the households living around the International Journal of Forestry Research watershed within a 10 km radius from the state forest ( Figure 2). e basis for community within the 10 km buffer zone was on assumption that individuals within this radius actively interact more frequently with the ecosystem more than those living outside the ten kilometers radius.

Socioeconomic Characteristics.
Fifty-seven percent (57%) of the respondents were female, while about 43% were male. About 67% of the respondents were in the cohort of age between 36 and 60 years, while about 10% and 23% of the respondents represented above 60 years and youth cohort, respectively. e majority of the inhabitants fall within the active and youthful cohort, a population that is likely to grow. About 97% of the respondents had attended school while 3% had not. Twenty percent of the respondents had attained postsecondary education with only about one percent reporting to have attained postgraduate studies. e main occupation of the inhabitants was crop farming as reported by about 78% of the respondents (Table 1). e youngest respondent was aged 20 years while the oldest was 85 years with a mean of about 45 years. e household size ranged from one and twenty individuals with a mean of six persons, while land ownership ranged from 0.25 and over 100 acres with a mean of 6.2 acres. e community is agropastoral owning between 1 and > 30 livestock reported in the study as tropical livestock unit (TLU) at a mean of about four. e household net annual income ranged between KES 1,000/ and over 3 million with a mean of KES 170,000/. e period lived by the respondent in the area varied between 1 and 79 years with a mean of 38 years. is suggests that the majority of the inhabitants have lived in the study area for more than three decades and there are no immigrants. e beneficiaries of the watershed reside between 500 meters to 35 km away from the ecosystem, though other resource users (water resource) lived farther away ( Table 2).

Perception on the Benefit and Importance of Elgeyo to Nonuse Services.
e survey inquired on whether the local community benefited from cultural/spiritual and biodiversity conservation. e majority of the respondents, however, reported not to be utilizing cultural, recreational, and biodiversity conservation services as recorded with about 80% of the population (Figure 3). at notwithstanding, the community perceived the ecosystem as critically important as confirmed by the responses where, for instance, about 60% of the respondents reported that the watershed was important for biodiversity conservation while about 4% reported it as least important (Table 3). About 51% of the community, on the other hand, perceive the ecosystem as important for cultural and spiritual services, while about 10%, 14%, and 18% perceive it as least important, more important, and most important (Table 4). In other words, on a scale of 1-5, one being the least important and 5 being the most important, the study would report that the majority of the community would rate the ecosystem at three (3)   values ranged between 1 USD and 95.2 USD. Overall, the mean ± SD WTP per capita per annum was estimated at 7.4 ± 0.3 USD, 9.1 ± 0.5 USD, and 11.1 ± 0.7 for the cultural, bequest, and biodiversity conservation, respectively ( Table 5). Overall, a majority (97%) of the population was willing to pay for the abovementioned services while only 3% were not willing to pay. Although the majority of communities around the ecosystem were willing to participate and pay for nonuse, about 51% on each category quoted less than 5USD, while about 30% were willing to pay between 5.1 USD and 10 USD with about 2% willing to pay more than 40 USD. Overall, the majority (∼80%) of the respondents were willing to pay between 1 USD and 10 USD while less than 20% of the respondents were willing to pay more than 10 USD for all the services quoted and bided (Table 6).
Worth noting, overall, the mean maximum WTP stated varied significantly across administrative units and key socioeconomic parameters for all ESs quoted. e multivariate regression exhibited statistical significance, regardless of the type of multivariate criteria used where, for instance, Wilks' lambda has F (75,203)� 4.03, p < 0.05. e model explains 63%, 78%, and 69% of the variance for cultural, bequest, and biodiversity, respectively (Table 7). e findings suggest that communities in one administrative unit will value nonuse services differently from their peers from the other administrative unit fundamentally based on their understanding of ecosystem services and perception.
ough administrative location had a greater influence on the mean maximum significant difference, the study also recorded socioeconomic parameters to influence the variance on the mean maximum WTP across the ES.
e socioeconomic values examined included the household income, household size, sex, age of the respondent, land size, period lived, distance from the forest, and the tropical livestock unit (TLU). e parameters were regressed against the mean WTP of cultural, bequest, and sustainability/biodiversity services as presented hereunder.

Cultural Services.
Linear regression on maximum WTP for cultural services as a function of socioeconomic parameters as aforementioned exhibited a significant difference with F (9,304) � 5.10, p < 0.05. e difference in mean maximum on the socioeconomic parameters on the study can be explained by about 11% (adj. R-squared � 0.106) of the analysis. Furthermore, individual parameters at a 95% confidence level indicated that education, age, and income influence the maximum WTP stated by the community within the watershed. e higher level of education the individual attained is likely to increase the maximum WTP by KES 84.70 on cultural values, while an increase in age reduces the max WTP by at least KES 11.33. Household income, though low, records to influence the maximum willingness to pay by KES 4.00 in every KES 10,000 increase on income (Table 8). Another important parameter, though not significant at 95% CL, is the period an individual lived in the area, and it enhances the value by KES 5.20 more than newer individuals. is suggests that community members that have lived longer understand the flow of ESs and attach higher value and are, thus, willing to pay a higher amount on cultural/spiritual services compared to members that are newer to the area.
is could be explained on the basic understanding on the education level and younger longer life expectancy compared to older while an individual that lived in the area longer had experienced and enjoyed cultural/spiritual services more than new individuals.

Bequest Ecosystem Services.
e regression analysis exhibited a significant difference in the maximum WTP for bequest against the parameters listed with F (9,304) � 4.70, p < 0.05. e model explains about 10% of the variance on maximum WTP in the study with adj. R-squared equivalent to 0.096. e socioeconomic parameter about bequest services exhibited varied significance, where sex, age, and TLU recorded influence on the maximum WTP. An increase in the age of individuals reduces the maximum WTP by about KES 16.76, while the likelihood of male respondents' enhanced amount was stated by KES 249.00 and vice versa on the female. Similarly, the higher the livestock owned by HH, the higher the maximum WTP by KES 34.90. e findings suggest that younger people would like to preserve the ecosystem for future use while the older population thinks otherwise; thus, the WTP value is lower. Male individuals seem to attach a higher value to bequest compared to their female counterparts. Similarly, people who had lived longer in the watershed may have benefited from the watershed and, thus, justify higher WTP compared to new members of the community that may have International Journal of Forestry Research not seen its full benefit (Table 9). Value on TLU would be explained by the benefit of grazing areas, where the community would preserve the ecosystem and possibly take care of the livestock in, for instance, times of drought. Worth noting, period lived, distance, land size, household income, and size do not influence the decision of the community to preserve the ecosystem for future use.

Biodiversity Conservation.
e linear regression analysis exhibited a significant difference in maximum WTP as a function of socioeconomic traits with F (9,264) � 3.08, p < 0.05 onetheless, as the society. e model explains about 8% of the significant difference in the study as provided by the adj. R-squared equivalent of 0.0846. At 95% confidence level, age, income, and TLU are cited as factors determining the    e other factors though with a p value slightly above 0.05 are sex and period lived in the area at a 5% error level. Male individuals attached a higher value to biodiversity conservation services than their female counterparts. Furthermore, the longer period lived in the area had highly enhanced the maximum WTP by at least KES 10.35 to biodiversity conservation (Table 10). Education, household size, and distance from the forest were not factors influencing sustainable biodiversity conservation.

Benefit and Level of Importance of Nonuse ESs.
e majority of the respondents, however, reported not to be utilizing cultural, recreational, and biodiversity conservation services as recorded with about 80% of the population. at notwithstanding, the findings did not, in any way, contradict the criticality of the ecosystem in the provision of ESs quoted as would be confirmed by a majority (>90%) of the respondents that reaffirmed the importance of the Elgeyo ecosystem. is is similar to the sentiment shared in a study in Uganda on WTP on the importance of existence and sustainability values [39]. However, the response of the majority not benefiting implies a lack of understanding on how biodiversity conservation is connected with community socioeconomic, livelihood, and wellbeing [40]. Nonetheless, the community perceived the ecosystem as critically important as confirmed by the responses where, for instance, about 60% of the respondents reported that the watershed was important for biodiversity conservation while about 4% reporting it as least important. On a scale of 1-5, one being the least important and 5 being the most important, the study would report that the majority of the community ation as a function of socioeconomic parameters. would rate ecosystem at three (3) out of five (5) on perceived importance on nonuse values.
is confirms the indirect benefits associated with nonwood forest products accrued by the community; even though not benefiting directly, they would still be motivated to conserve it. ese are similar to the sentiments made in a study in Cambodia on nontimber products [41].

Maximum Willingness to Pay (WTP) for Nonuse
Ecosystem Service. Albeit the local community appreciating the nonuse values the maximum WTP would be influenced by socioeconomic traits and the jurisdiction. ough the administrative location had a greater influence on the mean maximum significant difference, the study also recorded socioeconomic parameters to influence the variance on the mean maximum WTP across the ESs. e socioeconomic traits examined included the household income, household size, sex, age of the respondent, land size, period lived, distance from the forest, and the tropical livestock unit (TLU).    [42][43][44][45][46]. On cultural/spiritual values, the study records, the level of education, age, and income influence the maximum WTP, whereby the higher level of education and income resulted in enhanced maximum WTP while an increase in age negatively influences the maximum WTP on cultural values. e other important one, though slightly significant, is the more the period lived within the ecosystem, the higher the maximum WTP. Most importantly, the beauty of the ecosystem and the value attached to   ough observers' attachment of culture is reported differently from the literature, the majority agree with sentiment with the literature on valuation of cultural/spiritual values that "there is no doubt that the valuation of the scenic beauty of forests is affected by the different cultural and social traits held by the observers" [47][48][49].
On the other hand, bequest also referred to as "sustainability" value in some literature [39] records sex, age, and TLU of the respondent to influence the maximum WTP, while, for instance, an increase in the age of an individual reduces the maximum WTP. On respondent sex, male respondents were likely to pay more than their female counterparts. e other factors include TLU and the period lived in the area whereby an increase positively influences the maximum WTP. Similarly, the higher the livestock owned by HH, the higher the maximum WTP. On the other hand, the willingness to pay for biodiversity conservation recorded a negative correlation in respect to the respondent's age and income, contrary to a study in the Philippines on a ridge to reef ecosystem-based valuation [40], and a positive correlation on TLU and period lived in the area. Partly though, sex is also reported to influence the maximum WTP, whereby male individuals are seen to have attached a higher value to biodiversity conservation service than their female counterparts.
Overall, the individual willingness to pay on nonuse value ranged between 1 USD and 95.2 USD, with a Mean ± SD WTP per capita per annum estimated at 7.4 ± 0.3 USD, 9.1 ± 0.5 USD, and 11.1 ± 0.7 for the cultural, bequest, and biodiversity conservation, respectively. Cumulatively, a majority (∼80%) of the respondents were willing to pay between 1 USD and 10 USD while less than 20% of the respondents were willing to pay more than 10 USD for all the services quoted and bided. e aggregated estimates would be reported to be within the range of most of the literature [11,40,[49][50][51][52][53][54] on nonuse values that reported more than 90% of the targeted respondents quoted between 1 USD and 100 USD for nonuse values.

Conclusions
Although there was significant variability in the monetary value quoted on the nonuse ecosystem benefits, the local community appreciates ecological conservation even though it does not necessarily benefit directly. is was evident from the majority (97%) of the population that was willing to pay even though such schemes would attract cost to the benefiting community when established. is is a reflection on the preference of the society to sustainably conserve the water catchment ecosystem as it believes to support human wellbeing both directly and indirectly. e findings agree with most literature that revealed that ecosystems have high economic value since the society believes it is critical on the socioeconomic agenda and livelihood [53][54][55][56][57]. Nonetheless, parameters such as the location and socioeconomic and cultural respondent traits influence the mean maximum willingness to pay for nonuse values. is is fundamentally based on an individual level of understanding and perception of ecosystem benefits. Critically though, in addition to the area of the respondent, the age of the population seems to influence the maximum WTP across the non-use cohort, where the younger population is reported to attach high value compared to older folks.
Nonetheless, as the society explores the valuation of nonmarketed ecosystem products using stated preference, there will be a need to distinguish between genuine WTP and "push away" quoted values. e study estimates are not absolute, and thus, the generalization of findings to the entire population can be applied with caution because of the limitation that includes the "push away" values and low level of understanding of the importance of valuation. Nonetheless, in the absence of other local studies on the valuation of non-use values, the findings estimate can still be used while taking into consideration the limitation stated. ese values could also form a basis of policy reviews and support of sound decision making, particularly on forest conservation locally [11]. e acceptability by a majority would also support the establishment of schemes such as payment of ecosystem e findings should provoke the establishment of forest enhancement policies such as reforestation, subsiding LPG and electricity, and advocacy on forest conservation to reduce forest degradation. is effort should be complemented by the local community, state, and nonstate actors to conserve already shrinking ecosystems. e study can be a baseline for the application of nonmarketed ES valuation techniques locally; however, the study recommends further explicit exploration on other stated preference techniques such as the choice experiment model or conjoint locally either for comparison or unravelling the techniques' uncertainties. Ultimately, a strong justification for the application of such data in the development of PES schemes in Kenya, local policy reviews, and project appraisals is built.
Data Availability e [Contingency Valuation] data used to support the findings of this study are attached as a supplementary file and would also be made available from the corresponding author upon request (e-mail: jeregae@gmail.com).

Conflicts of Interest
e authors declare no conflicts of interest.