deflation vs prosperity

deflation

noun
  • A decrease in the general price level, that is, in the nominal cost of goods and services as well as wages. 

  • The removal of soil and other loose material from the ground (or another surface) by wind, leaving it exposed to erosion. 

  • An act or instance of deflating. 

  • An economic contraction. 

prosperity

noun
  • The condition of being prosperous, of having good fortune 

How often have the words deflation and prosperity occurred in a corpus of books? (source: Google Ngram Viewer )