If your economics class was graded on a curve and everyone agrees to study only half as much, everyone would get the same grade that they otherwise would earn. You, however, will earn an A if you study more than the others, a C if you study the same amount as others, and an F if everyone else studies more than you. You don't like studying, but you'd rather study and get an A than get a C without studying, or study and get a C than get an F without studying. All the students in your class get together and agree not to study but have no way of verifying if anyone does study. What is it in your best interest to do?
not study
randomize over studying and not studying
drop the class
study

An Oligopoly is when there are few large firms operating in an industry. Collusion is when people come together and decide on a particular course of action. It is usually non competitive

The dominant strategy here is to study.

Dominant strategy is the best option for a player regardless of what the other players are doing.

the students prefers to study more and get an A or to study the same amount as other students and get a C. Her least preferred option is an F. Since she does not know the actions of the other students, are best option is to study