1) The study used experimental games with 250 farmers in Tanzania to examine how financial payments (PES) and regulations could impact intrinsic motivations to conserve forests. 2) Private PES payments substituted intrinsic motivation, resulting in short-term crowding out, but donations returned to original levels after payments stopped, indicating no persistent crowding out. 3) Regulations increased donations more than their economic value, suggesting they appealed to motivations beyond expected fines, and resulted in persistent crowding in of motivations even after the policy ended. However, collective PES payments were unsuccessful in changing motivations.
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