6 Individuals do not keep a written account of their balance of trade with other individuals. For example, John doesn’t keep an account of how much he sells to Alice and how much he buys from her. In addition, neither cities nor any of the 50 states calculate their balance of trade with all other cities and states. However, nations do calculate their merchandise trade balance with other nations. If nations do it, should individuals, cities, and states do it? Why or why not?