Big Byte Inc. sold 15,000 computers to the government of India. Instead of receiving cash, the company received refined petroleum as payment. This is an example of

This is an example of barter

Explanation:

Barter in trade, is a term used to describe a system of exchange where goods  and services are exchanged for other goods or services directly. It is used most often in international trading, when there is a financial crisis, or when currency is unstable.

Barter is advantageous when money is in short supply, and when traders cannot afford to store a short supply of money, especially during hyperinflation.

However, there are some challenges with barter, which includes:

that both parties might not have what each other need in goods (double coincidence of wants), there is no common measure of value and indivisibility of certain goods when only half the worth is to be exchanged.

so they can see what that city is producing and to also see if they can some how get that product. like gold in africa.