This document provides an overview of cost analysis concepts, including definitions of different types of costs, cost-output relationships, and break-even analysis. It defines cost as the money incurred to produce a product or service. Various types of costs are described, including fixed and variable costs. The relationship between total, average, and marginal costs at different output levels is explained using tables and graphs. The optimal production level occurs where average total cost is minimized and marginal cost equals average cost. Break-even analysis is also introduced as a tool to determine the output level required to cover total costs.