Household Expenditure.- Variables, a Short Taxonomy.- Sets and Functions.- Market Equilibrium Model.- Rates of Change and the Derivative.- Optimal Level of Output and Long Run Price.- Nonlinear Models.- Additional Topics in Perfect and Imperfect Competition.- Logarithmic and Exponential Functions.- Production Function, Least-Cost Combination of Resources, and Pro?t Maximizing Level of Output.- Economics Dynamics.- Mathematics of Interest Rates and Finance.- Matrices and Their Applications.