That being said, it is important to take a look at what Keynes himself said about the consequences of inflation:
By a continuing process of inflation, governments can confiscate, secretly and unobserved, an important part of the wealth of their citizens. By this method, they not only confiscate, but they confiscate arbitrarily; and, while the process impoverishes many, it actually enriches some. The sight of this arbitrary rearrangement of riches strikes not only at security, but at confidence in the equity of the existing distribution of wealth. Those to whom the system brings windfalls . . . become 'profiteers', who are the object of the hatred of the bourgeoisie, whom the inflationism has impoverished not less than the proletariat. As the inflation proceeds . . . all permanent relations between debtors and creditors, which form the ultimate foundation of capitalism, become so utterly disordered as to be almost meaningless. (from pages 220-233 of The Economic Consequences of the Peace (1919))
Some will point out that he begins by stating that a "continuing process of inflation", and that perhaps a one time stimulus would be good. Let's look at the value of the dollar after we completely abandoned commodity money in 1971. (chart from here)
Look at what happened to the cost of living when the USA went off the gold standard. We are clearly in a "continuing process of inflation". Let's look at the lower part of the graph for some interesting events in US history.
- 1860-1865: Funding the civil war creates massive inflation.
- 1913-1920: The Fed is created, an agricultural depression occurs.
- 1930-1940: The Great Depression.
- 1940-1945: Funding WWII.
- 1970-1980: End of Bretton-Woods
- 1980-present: Stable 2-3% inflation
To your left you'll see a table charting the declining value of the dollar since the creation of the Federal Reserve in 1913. The dollar lost 50% of its value (you need twice as many dollars for the same purchasing power) between 1913-1920, 1920-1970, 1970-1980, 1980-2000. From 1913-2008 the dollar has lost ~95% of its value.
Now that continuing process of inflation is clear, lets revisit some of the consequences that Keynes' spoke of:
- Governments can, in a hidden way, arbitrarily confiscate the wealth of their citizens.
- Typically the poor and middle class lose money while foreign and domestic banks and other financial institutions profit from inflation.
- When the poor and middle class see this arbitrary rearrangement of riches, it is blamed on capitalism.
- Eventually the relationship between creditors and debtors is so distorted that the debtors will never possibly be able to pay back what they owe, and so the two terms become essentially meaningless.
Keynes is saying that inflation can be dangerous. Not in the mere sense that people will lose value of their money, but that it undermines the entire system of capitalism! Nowadays, deflation is a dirty word. In the not so distant future inflation will be the dirty word. The truth is that there are no dirty words in economics, but in politics. This is what is happening in the USA. Furthermore, the politicians are acting on the assumption that we are not in a "continuing process of inflation" and thus a one time "stimulus" would possibly work. Keynes implies that is an exceedingly dangerous assumption.