Inflation killed the Zimbabwe currency because delusion caused it to become worthless not because of availability or velocity issues that people are worried about in Bitcoin. These are two separate issues that people always seem to talk past each other on the subject of Bitcoin deflation. Splitting a Bitcoin into smaller units allows for unrestricted availability and velocity. Anyone can always buy and sell at market rates to complete a transaction. Inflation or Deflation of the currency has no effect on its availability. So why is it bad if it is deflationary?