two, if you think people won't consume if the money is deflationary, you're crazy. The US had net deflation for most of its history (except during wars) from 1600-1910, and certainly there was plenty of growth. Also, analogous to the "why do you ever bother buying computers knowing that they depreciate rapidly".
three. If you think laborers get paid wages that match inflation, you are crazy. In fact, as krugman himself states: http://krugman.blogs.nytimes.com/2010/02/13/the-case-for-hig... " that there’s another case for a higher inflation rate ... It goes like this: even in the long run, it’s really, really hard to cut nominal wages. Yet when you have very low inflation, getting relative wages right would require that a significant number of workers take wage cuts. So having a somewhat higher inflation rate would lead to lower unemployment, not just temporarily, but on a sustained basis."
You cannot simultaneously make the claim that inflation will fix the sticky wages problem and also claim that wages will catch up with inflation.
four. "when "bury it under the ground" isn't an acceptable investment strategy earning average returns, more real goods and services will be produced." in other words, artificially encourage people to spend so as to enrich the already-wealthy. This should give a hint as to where the wealthy actually do store their wealth, and why inflation benefits them while stealing from the poor. Related: Encourage people to artificially spend more money on stuff they don't need without regard to the downstream environmental effects of increased consumption.