Which best describes the standards required for foreign producers

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.

The economy of the united states is best described as

What has contributed to the growth of agriculture as big business in the midwest