Background problem of this research was the inflation in Indonesia considered to be still higher than that in the other ASEAN countries, the rate still needed control toattract foreign direct investments which were decreasing in the recent years. The form of foreign direct investment was mostly from capital-intensive, so that it could not elevate the unemployment and could not increase the purchasing power of the Indonesian people. The purposes ofthis research was to examine and analyze the inflation factors (caused by both theaggregate demand and cost pressures of national production) against the foreign direct investment and unemployment and their impact on the people’s purchasing power in Indonesia. This research used secondary datatime series for 32 years since 1982 to2013.The research method used is explanatory research to explain the causal relationship between the variables in a model, through hypothesis testing. The analysis employed statistical technique of simple and multiple linear regression. Theresults of the research showed that these factors of money supply M2, price of fuel, ICOR, interest rate,exchange rate, and the terms of trade are simultaneously and partially effect on inflation. Inflation gives positive effect on foreign direct investment and unemployment. Furthermore,inflation, foreign direct investment, and unemployment have simultaneously and partialy on the people’s purchasing powerin Indonesia. This research has also found dominant factors wich effect inflation (ranked from the most dominant to the lesser): exchange rate, interest rate(cost push inflation), and thepriceof fuel, money supply M2(demand pull inflation).And the most dominant factor that influence the people’s purchasing power in Indonesia is unemployment. Keywords: Inflation factors, FDI, unemployment, purchasing powerin Indonesia.