This looks something like the following: Is There A Problem With This? The equilibrium price and quantity ($5 and 9 units for the sake of this example) are determined where the two curves intersect. We then have our famous supply and demand model. This will tell us how much consumers desire to purchase at any given price. Once we have done that, we can add in our demand curve. You could plot these data points in a graph like the following: Suppose they answer 5 units, 9 units, and 12 units, respectively. Assume the possible prices were, say, $2, $5, and $8. A supply curve answers this question: Given a market price, what quantity of the good will a firm supply to the market?Īt first glance, there doesn’t seem to be anything wrong with asking such a question. Suppose that we went to a local business and asked them how much output they would choose to produce. Let’s take a step back in order to examine what’s going on. The entire problem centers around the concept of a supply curve. I’m here to tell you that this entire model is wrong. As we know, those equilibrium points change as the supply and demand curves shift. You came to understand how a supply curve and a demand curve cross in order to produce an equilibrium price and quantity. Maybe you’ve taken an introductory course in economics. We’ve all heard economists and analysts utter the expression, “It’s all simple supply and demand!” when trying to explain some market phenomenon.
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