I have to make a comment. You are making a grave mistake. You are NOT using the quantity theory of money! you are using the simplified version, know as cambridge equation, which is total nonsense, since it comes from keynesian liquidity preference theory. Your collapsing V is also nonsense. The true equation is Mx V = P x Q, Where Q is anything money can be spent on, and P is Not the CPI or GDP deflator, but prices of anything that money can be spent on. You con't have a collapse of V, but an incorrect mesurement of P, which is prices of everything, goods and services, stocks, bonds, golds etc. If you define inflation to be the increase in all prices, including stocks and bonds, then we are already in an hyperinflation situation!