(accounting profit) ( , , , ).
= ()
.
= ( +)
()(economic profit). ( > ). , . . .
(MC), (MR). , , , , . . MR > MC , . , : MR < MC .
, , (MR) (MC).
Q, MR = MC. . (marginal revenue= marginal cost rule).
( ) (economic profit)
(profitability, profitableness) , , , , . ( ) ( ).
(norm of profit) , ; , , .
.- (balance profit) .