A survey of the new theories of inflation that have developed over the past two decades in response to the inflationary pressures experienced by Western countries examines the shifting debate from explaining inflation as a causal process to explaining its increase as a result of constantly changing expectations.A survey of the new theories of inflation that have developed over the past two decades in response to the inflationary pressures experienced by Western countries examines the shifting debate from explaining inflation as a causal process to explaining its increase as a result of constantly changing expectations.A survey of the new theories of inflation that have developed over the past two decades in response to the inflationary pressures experienced by Western countries examines the shifting debate from explaining inflation as a causal process to explaining its increase as a result of constantly changing expectations.1. Inflation: definition and measurement; 2. Expectations and inflation; 3. The Phillips curve; 4. Monetarist inflation theory; 5. The hypothesis of structural inflation; 6. Stagflation; 7. Some traditional explanations of inflation.