[RayChuang88]

Here's what is hurting OPEC: cartels usually fall apart over time. Anyone who's taken a course in college economics knows that while cartels initially enforce a price floor, the temptation to "cheat" by individual cartel members selling a good at a lower price is VERY high, and that ends up putting an end to them over time.

[SeeSharp]

the temptation to "cheat" by individual cartel members selling a good at a lower price is VERY high

Andrew Carnegie once told a biographer the opportunity to cheat was the whole point of joining a cartel in the first place.