p Investment Determination 5 The determination of investment is one ofy the most complicated issue in 02 macroeconomics. You can list as many as possible factors that could affect investment Empirically, the investment function is the y most difficult one to be estimated . yInvestment Determination • The determination of investment is one of the most complicated issue in macroeconomics. You can list as many as possible factors that could affect investment. Empirically, the investment function is the most difficult one to be estimated