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The correct answer is money supply.
The money supply includes all monetary assets that are available in an economy at a specific time period. If the money supply drastically increases then inflation happens and if the money supply decreases then deflation happens. Both can cause horrors for the economy so the economists have to be careful.
I'm assuming that my answer is what you are looking for because your question is quite vague.
Paris, France is a capital city. Paris is the capital city of France.
Hope that helped you.