I'm still fuzzy on the whole inflation thing. Why is devaluing the dollar good for the average citizen? Why is reducing their purchasing power good for us all?
And why does the Central Bank want this inflation?
You asked why the fed targets a non-zero inflation target. This is actually a great question that is not easily answered. I'm not the best one to answer it, but I can shed some light on the possible reasons. I think the real reason the fed targets a non-zero, positive inflation may be linked to our being a nation that runs on credit. So let me say a word about credit first and then I'll get into possible explanations for why the fed targets a positive inflation.
Our Central Bank tries to achieve steady, slight, not very noticeable inflation. They have an official inflation target of 2% per year. Their typical means of targeting inflation is via adjustments to the Fed funds lending rate, which is a wholesale price at which banks can obtain money to lend out.
The fed moves the funds rate up when inflation is greater than their target, and down when it is less than the target. It's a relatively weak tool for targeting inflation and it targets only inside money, i.e., the credit cycle. It is a non-linear tool. Small incremental changes at already low interest rates have very little effect on the demand for credit, but above some ill defined higher rate the demand for credit will become more sensitive to interest rates.
A large part of the U.S. consumer economy runs on credit. There always comes a point where the amount of additional credit banks are willing to extend runs out. It's then that the consumer who is maxed out on credit must undergo belt tightening -- bankruptcies increase, and the economy moves into recession. The pattern of easy credit followed by higher rates and belt tightening is responsible for what is called the short-term credit cycle.
One reason, often given, is that negative inflation, i.e., price deflation, is so dangerous that if the Fed were to miss its target on the low side we would slip into deflation causing an increase in real interest rates, i.e., the buying power you return to your lender is greater than the buying power borrowed. In reality, however, small incremental increases in real rates near zero inflation would have virtually no more effect on prices than small decreases in rate do. There is probably an ~2% window on either side of the zero point before we would get into real trouble. In fact when the U.S. was on a gold standard inflation sometimes did dip briefly into negative territory and then return to near zero positive territory without serious effect.
What would be catastrophic, however, in an economy that runs on credit, would be significant deflation. Then the buying power of the dollar would rise, real interest rates would increase and real the cost of everyone's loans would rise. The economy would be thrown into a depression.
But I suspect there is a much better argument for why we target 2% inflation, and not 1% or zero. (No one has to ask why we don't target a negative inflation, the answer to that is obvious,
vide supra)
I suspect the real reason we target a 2% inflation rather than zero may go something like this. If we can target an inflation rate below GDP growth, and the return on capital can be maintained greater than the GDP growth, then targeting a positive inflation rate < or = to GDP growth will result in the real interest rate on debt declining over time; yet still allow for a net positive real return on capital. I suspect this is the real reason for choosing a 2% inflation target (somewhat arbitrarily of course within the constraints I just mentioned). A positive target < or = GDP growth helps pay off debt via inflation without eliminating a net positive real return on capital so long as return on capital > GDP growth, which it is in capitalist economies because those with capital to lend out will not risk lending it without a real positive return.
Now, I'd love to be able to ask a real MMT economist, like Wray or Mitchell, the only people who really understand this stuff, besides a genius like Bernanke, the same question you asked me.