Pain and sacrifice
Efforts and foregoing leisure
Subjective concept
All the above
Real cost
Total cost
Cost of production
Opportunity cost
Opportunity
Money
Accounting
Economic
Constant
Average
Diminishing at a decreasing rate
Rising
Average revenue
Total revenue
Total production
None
Average cost
Average fixed cost
Marginal cost
Total variable cost
Money cost
Fixed cost
Social cost
Implicit cost
Economic cost
Private
Social
Fixed
Variable
STC
SAC
TVC
TFC