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ECON545 Week 1 Suggested Answers to Questions and Problems
NOTE: Please pay particular attention to the way that answers are stated, because these are the kinds of statements that will be looked for in the quizzes and final exam. In general, all answers need to be supported with appropriate reasoning.
CHAPTER 3
Chapter 3 Question 8

8. See the figure above. A change in demand is a shift in the entire demand curve and is caused by a change in one or more of the determinants. In contrast, a change in quantity demanded is a movement along an existing demand curve caused by a change in price. This distinction is important. Say, for example, you want to distinguish between rising sales at existing prices due to an expanded advertising program, on the one hand, and rising sales due to a sale or a reduction in price, on the other hand. A change in supply shifts the curve and is caused by a change in one or more of the determinants. A change in quantity supplied is caused by a change in price.
Chapter 3 Question 11
11a. You would probably increase the prices of existing inventory of surfboards. You would be expecting a shortage in the short run, and wholesale prices of foam blanks would probably rise in the future. In fact, most retail outlets increased the price of their boards from $100 to $300.
11b. First, in the very near term, surfboard prices will rise, and the stock of polyurethane boards will fall. Over time, other companies will supply alter-native blanks that use alternative processes that avoid the use of TDI. Currently, epoxy is used along with polystyrene to create a blank, but some surfers say that these boards are slower in the water. Also, new approaches to making blanks may emerge. One defense contractor has developed foam material to protect the electronics in missiles that does not use TDI and is willing to license this for surfboards.
Chapter 3

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