16. As a cartel, OPEC can increase the price of oil by assigning production quotas for its members. The quotas decrease output of barrels per day and permit producers that were pricing oil at average cost to realize a profit. This sounds great for these producers! So why does a given country tend to produce beyond its assigned quota value. At what production level would a given country want to produce? How would such an action lead to break-down of the OPEC cartel? Illustrate and explain using graphs if possible.

those are short answer questions, please explain these with more detail, if have any graph would be better. Thank you for you help