Finding Short-Run and Long-Run Equilibrium
A market initially has N=20 firms each with identical costs C(q)=0.25q2+100.
Demand is QD=1600-40p.
Assume a constant cost industry.
(a) Find the short-run market supply
ANS. (a) Each firm chooses q where MC=p 0 .5q=p q=2p
With N=20, QS=20(2p)=40p
please explain the answer why 0.5q=p then q=2p
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