Money is the means by which people transact. To use a simple metaphor, if the economy is an engine than money is grease that allows everything to run smoothly. In this metaphor though it's not the main output of the engine, nor is the fuel that makes it move. So if there is a shortage of money it can make it harder for people to transact, hurting the economy. Printing extra money doesn't increase the amount people are able to produce, it may help increase demand since people will be more willing to spend initially.
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