If you mean, why don’t they print money and set it aside for themselves when it comes time to pay for things, then:
Hyperinflation. The more money in the system, the less each dollar is worth, the more businesses will charge for product and services. When people realize what’s happening, they hoard, driving prices further up. This vicious cycle is why governments, central banks specifically, keep a right control on how much of it’s currencies are in circulation
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