the beauty of a flat currency is that you have a liquidity multiplier.
It works like this, you divide the emision by the minimun monetary reserves that are asked to be put aside to banks and institutions.
Why. Lets say the FED puts out $100 and that the minimun reserve is 10%.
The 100$ goes to chase manhatann bank. They take 10$ and gives em back to the fed for safe keeping. and lend $90 to jhon doe. He takes his $90 and puts it into first national bank. They take the $9 put em aside and lend $81 to jane doe. By now there are $271 circulating in the economy. keep on doing that into infinity and you have that $100 turned into $1000.
This of course isn´t as simple as the example. It depends largely on what percentage of all monetary transactions occur electronically... when there´s no paper currency this occurs perfectly.
It also depends on the people´s perception of the value held by the currency, a currencie that´s least safe {like the nicaraguan cordoba} will require larger safety deposits from all banks, than a currencie that´s considered safer, such as the dollar or the pound.
The thing with the liquidity multiplier is that liquidity evaporates when thigs heat up... and there´s panic. That´s what happens when everyone tries to withdraw all money from the bank the same day. The bank goes broke and you only get a small % of your money back. {if it happens at every bank in the above example, the same day, you get 10% of your money back... cause in the end, that´s all there really is}
So having a small reserve means there´s going to be a lot of liquidity in the market... but it also means that if it evaporates people are left with much less...
You cant do this with gold standard as all your money in circulation has to be backed by it´s whole value, not in money but in gold. So your monetary supply is fixed to the amount of gold that you have in available...
Is much less risky, but it is also much less profitable.