If Qs = -20 + 10p, and Qd = 400 - 20p, what is the equilibrium price and quantity?
If Qs = -20 + 10p, and Qd = 400 - 20p, then in equilibrium Qd = Qs, so:
−20+10p=400−20p,-20 + 10p = 400 - 20p,−20+10p=400−20p,
30p = 420,
p = 14,
Q=−20+10×14=120Q = -20 + 10×14 = 120Q=−20+10×14=120 units.
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