What method(s) would you use to test a psychological hypothesis you might have?

Which of the following credit scores will most likely get you the least expensive interest rate on a car loan

Afarm grows soybean and produces chickens. the opportunity cost of producing each of these products increases as more of it is produced. draw the? farm's ppf. label it ppf0. the farm adopts a new technology which allows it to use fewer resources to fatten chickens. draw a ppf that illustrates the impact of the new technology. label it ppf1.

What are the countries in south asia?