Marie decides to work all summer rather than going on vacation. she will be able to earn money and learn new skills but will not be able to spend much time with her friends. what is the opportunity cost in this scenario? going on vacationspending time with friendsearning moneyworking all summer

At every point in our social behavior (and not only that), we are faced with choices. While each choice may have its merits, we choose the best for us. But even the one we deem best is associated with at least one negative element; we lose the opportunity to pursue another choice. Thus, by choosing not to go on vacation, she loses the opportunity to spend some time with her friends. Think of another scenario; you have a test tomorrow and decide not to go to a party. While this is a good decision in the long-term, you pay the opportunity cost of not going to the party (not going on vacation respectively) and thus the opportunity cost is again "spending time with friends".

In financial aspects, a depression is a sustained, long haul downturn in monetary movement in one or more economies. it is a more extreme monetary downturn than a recession, which is a slowdown in financial action through the span of a typical business cycle. a depression is an irregular and extreme type of recession. so depression is always followed by recession but it is not correct to state that a depression always follow a recession.