This whole discussion is missing a major point in my eyes.
Inflationary expectations is a major driver of inflation of prices. If people expect the prices to increase, they will buy earlier. That leads to producers having pricing power, so they tend to increase prices, which leads to... higher prices, and confirms the consumer expectations.
This is also why you can't really use money supply as a measure of inflation. As you note "money is just a stand-in for other goods" - which of course leads to the standard definition of inflation. If money is a stand-in for other goods, then we measure how much of these good money can buy. That's exactly what the standard definition of inflation captures.
> If money is a stand-in for other goods, then we measure how much of these good money can buy. That's exactly what the standard definition of inflation captures.
Which is completely useless if you don't take into account how much money people have to buy things with. What you want is a metric of prices vs. wages, which neither version of inflation takes into account. Money supply inflation would be a better predictor of prices vs. wages, however, since when the money supply is inflated prices tend to rise faster than wages (and vice-versa). Price inflation is a lagging indicator which incorporates a bunch of noise along with the delayed signal, especially when the supply is deliberately manipulated to achieve specific CPI targets.
For an even better predictor, look at money supply vs. actual economic output. If the economy's producing 20% more actual stuff, and the money supply grew 20%, that's not inflation. That's stability.
Inflationary expectations is a major driver of inflation of prices. If people expect the prices to increase, they will buy earlier. That leads to producers having pricing power, so they tend to increase prices, which leads to... higher prices, and confirms the consumer expectations.
This is also why you can't really use money supply as a measure of inflation. As you note "money is just a stand-in for other goods" - which of course leads to the standard definition of inflation. If money is a stand-in for other goods, then we measure how much of these good money can buy. That's exactly what the standard definition of inflation captures.