Why primitive societies led to invention of money

No one knows for sure who first invented such money, but historians believe metal objects were first used as money as early as 5,000 B.C.

Around 700 B.C., the Lydians became the first Western culture to make coins. Other countries and civilizations soon began to mint their own coins with specific values. Using coins with set values made it easier to compare values and trade money for goods and services.

Before the invention of currency (and for many centuries after), bartering societies would trade goods for other goods.

there was no passage listed but using the process of elimination i'd say it was d. the high economy would do the opposite. i don't see how low prices would affect it. high unemployment is possible but i feel d is the better answer.

answer; /// egg production using the factory technique falls less than with the free range technique;