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This is also why in the real world the fed can triple the size of the money supply without causing inflation. Of course the austrians predict, over and over again, that runaway inflation is going to happen Any Time Now. But it doesn't and it won't.What makes you so sure no runaway inflation will occur? Just because you haven't seen it yourself yet, it's unimaginable?
You're right about two things: inflation happens when more money is competing for the same goods, and increasing the money supply does not by definition cause inflation. The conclusion you are drawing ('the fed can triple the money supply without triggering inflation, and runaway inflation will never happen') doesn't follow from that though. Yes, all the money pumped in the economy is sitting on bank accounts right now, interest rate is near-zero and nobody is investing (throwing easy money at Wall Street for short time profits, jacking up the DJIA doesn't count as 'investing'). That's the sentiment right now. What do you think will happen when the economy picks up some steam, people get more confidence, and investments and consumption goes up?
The tricky bit about 'runaway inflation' is the 'runaway' part. You can only control inflation by very careful monetary policy, because economies are like oil tankers: they change direction very slowly, but if they start moving you can't stop them anymore. Runaway inflation doesn't occur when you increase the money supply, because when you are increasing the money supply, it's because the oil tanker has almost stopped, and you want to get it going. The question is what happens if it picks up too much speed further down the line.
Maybe you don't believe in dollar hyperinflation, but the observation that 'austrians predict runaway inflation over and over and it never happens' is simply wrong. It didn't happen for dollar, euro or yen, but it happened in Weimar, Zimbabwe, Urugay, Argentina, all within 100 years time.