The costs economists use in the concept of economic profit are:

A) accounting costs.
B) strictly dollar costs,not opportunity costs.
C) only implicit costs.
D) accounting costs and implicit costs (i.e. ,the value of the best opportunity forgone) .

Implicit Costs

The opportunity costs of using resources that a firm already owns to produce goods or services instead of earning money from these resources elsewhere.

Accounting Costs

Expenses recognized in a company's financial statements or accounts, representing outlays related to its operations and maintenance.

Economic Profit

The difference between total revenue and total costs, including both explicit and implicit costs.