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Chapter 1Figure It Out 2.3

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Suppose that the supply of lemonade is represented by QS = 40P, where Q is measured in pints and P is measured in cents per pint.

If the demand for lemonade is QD = 5,000 – 10P, what are the current equilibrium price and quantity?

The current equilibrium price is

The current equilibrium quantity is

The equilibrium price equates quantity demanded (5,000 – 10P) and quantity supplied (40P). A price of 100 cents results in a quantity demanded of 4,000 pints; that price also results in a quantity supplied of 4,000 units. For further review, see section “Market Equilibrium”.
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      Suppose that a severe frost in Florida raises the price of lemons and thus the cost of making lemonade. In response to the increase in cost, producers reduce the quantity supplied of lemonade by 400 pints at every price. What is the new equation for the supply of lemonade (denoted QS2)?

      A.
      B.
      C.
      D.

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          After the frost, the demand for lemonade is QD = 5,000 – 10P, and the supply of lemonade is QS2 = 40P – 400. What will be the equilibrium price and quantity of lemonade?

          The equilibrium price will be

          The equilibrium quantity will be

          The equilibrium price equates quantity demanded (5,000 – 10P) with the new quantity supplied (40P - 400). A price of 108 cents results in a quantity demanded of 3,920 pints; that price also results in a quantity supplied of 3,920 units. So, comparing these numbers with the original price and quantity, the decrease in supply causes the equilibrium price to increase and the equilibrium quantity to decrease. For further review, see section “Market Equilibrium”.
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