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CHAPTER 1

The Nature and Scope of Managerial

Economics

33

APPENDIX TO CHAPTER 1: THE BASICS OF DEMAND, SUPPLY, AND EQUILIBRIUM
In this appendix, we present an overview of the functioning of markets. We begin by reviewing the concepts of market demand and market supply curves and then show how the equilibrium price is determined at their intersection. Afterward, we examine the effect on the equilibrium price resulting from a change in demand and/or supply. This appendix may be skipped by students who remember all of this from their principles of economics course.

The Demand Side of the Market
Every market has a demand side and a supply side. The demand side can be represented by a market demand curve, which shows the amount of the commodity buyers would like to purchase at different prices. For example, the market demand curve for aluminum in Figure 1-3 shows that 4 million pounds of aluminum would be demanded annually at the price of $1.50 per pound (point A), 6 million pounds would be demanded at the price of $1.00 per pound (point E), and 8 million pounds would be demanded at the price of $0.50 per pound (point B). Note that more aluminum would be demanded annually at lower prices; that is, the demand curve for aluminum slopes downward to the right. This is true for practically all commodities and is referred to as the law of demand. Demand curves are drawn on the assumption that buyers' tastes, buyers' incomes, the number of consumers in the market, and the price of related commodities (substitutes and complements) are unchanged. Changes in any of these factors will cause a demand curve to shift. For example, if consumers' tastes for aluminum products or consumers' incomes increase, the entire demand curve for aluminum shifts to the right, indicating that buyers will purchase more aluminum at each price annually. More will be said on market demand

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