Based on the demand and supply functions for the market for Halloween parties attended by MIT students, the equilibrium price is $100 and the quantity is 100.
The equilibrium price and quantity can be found by equating supply and demand.
This gives:
Price = Quantity
Price = 300 - 2p
300 = 3 x Price
Price = 300 / 3
= $100
The quantity would also be 100 parties.
The rest of the question is:
Think of price here as the amount of money party hosts will collect at the door from party-goers. The demand for parties is given by Q =300−2p. The supply of parties is given by Q = p.
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