Question

According to most interest-group leaders, which type of incentive draws in the most members? monetarysocialfixedidealist

Answer 1

I believe the answer is: purposive incentive.
purposive incentive refers to a form of reward to join a group that do not have a physical forms but simply to realize a certain collective goal.
For example, the purposive incentive of the majority members of environmental group is to make sure the government create a regulation to maintain the environment for all citizens.