One "design principle" that makes informal, community-based solutions to public goods and common resource problems more effective is: a. clear distinctions between who is and is not allowed to access the resource. b. the ability of users to monitor one another. c. all of these are important to the effectiveness of community-based solutions. d. the participation of resource users in setting the rules for use.

Option A, B and C.

Explanation: The design principle that makes informal, community-based solutions to public goods and common resource problems more effective are:

A.) clear distinctions between who is and is not allowed to access the resource.

B.) the ability of users to monitor one another.

C.) All of these are important to the effectiveness of community-based solutions.

answer; the best answer is (demand);