You avoid inflation by taxing everybody. That takes money out of the system. The "wealthy" are already taxed pretty heavily, and they don't buy a lot of stuff. In fact, your best bang-for-the-buck on reducing inflation is to tax the lower classes, since their money tends to be higher-velocity than the money of the wealthy. It sounds fucked up, but mathematically speaking, you need to tax the poor if you want to stop inflation.