The circular flow model demonstrates how money moves through society. Money flows from producers to workers as wages and flows back to producers as payment for products. In short, an economy is an endless circular flow of money.
this is what i looked up an got
ship building and fishing
The Great Wall of China if that's what your looking for
Probably it would be WOOD AND PLASTER AND STONE , CUZ in the 1600s houses were made like that
The correct answer would be the Rio Grande. I know because I had that question.
