What three types of dollars are used for cost analysis? Explain the concept of Constant Year Dollars (CY$) analysis as related to inflation Explain the concept of Then-Year dollars (TY$) analysis as related to inflation.. Explain the concept of (Net Present Value) NPV$ analysis. What Is the Purpose of performing a "Sensitivity Analysis" BONUS: In an Economic Analysis, why are the "Assumptions" so Important? Describe Life-Cycle-Cost