This document discusses inflation and the Phillips curve relationship between unemployment and inflation. It provides examples of hyperinflation in countries from 1921-1925 when governments printed too much money. The Fisher effect holds that nominal interest rates will rise one-to-one with inflation so real interest rates stay the same. Originally, the Phillips curve suggested governments could trade-off lower unemployment for higher inflation. However, expectations of continued inflation caused the relationship to break down. The augmented Phillips curve shows inflation rising along with unemployment in the long-run to the natural rate.