Causes of Inflation
1. Economic growth
2. Monetary policy
3. Increase in employment(decrease in unemployment)
John E. Sayre and Alan J. Morris, Principles of Macroeconomics: Measuring the Economy's Performance, Edition 6 (Toronto, Ontario: McGraw-Hill 2009), 138-147

Inflation can also be caused by:
1) Increase in production costs.
2) Increase in labour cost
3) International lending and national depts