Professor smith decides to track the dating behaviors of college students throughout their college careers. she decides to begin her research using her introductory class. after explaining the study, she assures students that their responses will be kept confidential. the students complete her survey during class. her research most clearly impinges on:

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.