What are the common denominators of 1/4 and 7/10​

An economic term that describes happiness and its hard to measure in numbers is

How does specialization enable countries to trade with one another? a country can make and sell goods affordably and buy goods that it is inefficient at making. a country can make what it chooses and sell its goods to other countries. a country can decide to buy everything it needs from other countries. a country can efficiently make goods that were once difficult to make.

Which factors slowed population growth in china until the 1300? a. one child policy. b. urbanization c. epidemics. d. warfare