This volume provides a basic understanding of the time value of money and the ways to most effectively estimate the relative changes in the current value of proposed activities. Formulae and factors are provided to calculate the future value of dollars spent today, the present value of expected future income, and various ways to estimate the costs of future income and expenses. There is very little economic theory here, but following the rules and guidance provided will yield excellent results when deciding between long-term options with variable income and expenses. In addition, risk and uncertainty are addressed and ways are provided to calculate the impact of risk and uncertainty on economic decisions. A brief look at income statements and balance sheets is provided as an adjunct to the evaluation of economic data. The end of the volume contains dozens of interest tables to make the calculation of economic decisions far easier than with the complex equations, which are also provided.