“A PES scheme, simply stated, is a voluntary, conditional agreement between at least one ‘seller’ and one ‘buyer’ over a well-defined environmental service – or a land use presumed to produce that service” (Wunder 2005). Conservation incentives programs are analogous to PES programs in that the payments are conditional on pre-agreed behavior or outcomes, although they are not necessarily conditional on the provision of ecosystem services (FONAFIFO 2012).