The correct answer is: "Purchasing Power Parity"
The theory of the Purchasing Power Parity is used to compare the cost of life and living standards between two countries that use two different currencies. This is done by comparing two curriencies through a basket of goods, by comparing their market prices and, therefore, how they are valued under each currency. This enables to conclude how much of each currency you need to purchase an specific product (a bike) and hence, the purchasing power of consumers who hold that currency.
Marine biodiversity is in ever-greater danger
It would seem the correct answer is the forth statement “College students have about the same psychological disorders as their same-age peers who are not attending college". Because both young and old have their own problems and stress which in time it turns into psychological disorders , but the students who attend college have to face with the responsibilities of being a student , an employee, a friend , and all of these factors cause too much stress and eventually it becomes in one if not several psychological disorders. Their same-age peers who are not going through college are not off the hook either, they have to face with their own families and friends judging them for not going through college and have to go make a low-pay job which turns into more stress and eventually more psychological disorders.