How does development of trade depend on agriculture and industry?

The relationship between agriculture,industry and trade is perplexing. Most of the raw materials are needed for industries are produced from agriculture sectors. Likewise,many goods that we export to foreign countries are produced from agricultural products. The country earns foreign currencies from these exports.

Trade is critical to the livelihood of the U.S. agricultural sector because it spurs economic growth for our farmers, ranchers and their rural communities. ... It also helps create all sorts of jobs in rural communities selling farmers products or selling things to those who sold farmers other things.