Money can very in its buying power a bit for a host of reasons, but there's one influence factor that can be manipulated quite easily:
The amount of cash.
Paper and coin money don't increase in quantity by much unless the government and/or central bank allow it.
Bank deposits (the other part of M3) can be regulated with rules for banking.
In short: There's no hyper-inflation with trillion dollar bills unless you print trillion dollar bills. You can refuse to print them, this creates a scarcity of paper money and increasingly scarce objects with a use tend to gain in value ceteris paribus.
Inflation beyond about 8% is really about government trying to finance itself (or get rid of its domestic currency non-indexed debt) with the printing press, not about other economic factors.
The use of foreign cash has advantages and disadvantages; a widespread use of foreign money essentially fixed he exchange rate to 1, it's like in a monetary union. This may be a huge problem for a trading country if its economy develops differently than the primary economy of the foreign cash.
Btw, I have a blog post under preparation about the new state/cash issue. Check my blog in a week if it's relevant to your interests.
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