The document discusses various concepts related to costs in health economics. It defines costs as the value of resources used for the production of good health. There are different types of costs including accounting costs, economic costs, opportunity costs, direct costs, indirect costs, average costs, and marginal costs. Accounting costs focus on past expenditures while economic costs also include opportunity costs. Direct costs are those directly related to an intervention while indirect costs are related to productivity losses. Understanding different types of costs is important for economic evaluation, priority setting, and making efficient management decisions in health care.