Coins were first invented in the 7th century B.C.. in Lydia. They were made from gold and silver. People made coins of different sizes and gave them different values. Coins were good in many ways. First, they could be carried easily. Second, they made exact exchanges possible. Everyone like the idea, so quickly became popular.
Q: What does 'the idea' refer to in the last sentence?

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asked by rfvv
  1. The idea means the use of coins.

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