It allowed people to buy and sell goods in a wider market.
Explanation:
Before coined money people couldn't sell or buy things in a wider market. After the development of coins, people could use them to buy what they wanted and coins held their value for a very long time. Before coins, you had to trade something you had for something you need. If the other person didn't need what you were offering he would not take the offer to trade. But with coins that changed since the merchant always has a use for a coin when compared to a carrot.
