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profit
the total revenue - the total cost
profit calculation
pi = TR - TC
supernormal profit
occurs when profit is greater than 0 and the total revenue is greater than the total cost
normal profits
when profit is equal 0 and TR = TC
subnormal profits
when profit is less than 0 and the TC<TR
what does the MC/supply curve tell us
tells a firm the max number of units it can produce at a given price
short run shut down point + graph
occurs when the marginal cost/supply meets the minimum point of the average variable cost curve

long run shut down point
occurs when MC/S = AC
cost and revenue diagram
profit is the red box

what a change in demand shift in the costs and revenue diagram
AR and MR ( draw digram
what does a change in fixed costs shift
AC ( draw diagram)
what does a change in variable costs shift
the AC and MC curve