central banks have one where they control the amount of money in circulation through interest rates to match the size of the economy.
if you have another one good for you but you have to have one.
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I tend to think that any amount of money is good enough for any size of the economy, however the size of the economy is measured.
If this were not the case, you'd have to justify adding or subtracting monetary units based exactly on what? When can we say that we have too much money or not enough money?
When prices go up there is too much money and when they go down there isn't enough.
It's not that difficult now is it.