Purposive incentives appeal to someone's concern about a cause because they feel satisfaction about taking part of something they believe in and agree with, and it is based on ideologial principles and ethical beliefs . It's a benefit for them because everyone needs some kind of reward, but it does not come necessarily in form of material rewards or bonus.
OPEC Nations like Saudi Arabia, United Arab Emirates , Kuwait e.t.c their land doesn't support agricultural products because of their desert areas rather they have major oil wells which is their major source of income.
