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#cfa #cfa-level-1 #economics #microeconomics #reading-13-demand-and-supply-analysis-introduction #study-session-4
It is often desirable to concentrate on the relationship between the dependent variable and just one of the independent variables at a time, which allows us to represent the relationship between those two variables in a two-dimensional graph (at specific levels of the variables held constant).
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In our example, there are three independent variables in the demand function, and one dependent variable. If any one of the independent variables changes, so does the value of quantity demanded. It is often desirable to concentrate on the relationship between the dependent variable and just one of the independent variables at a time, which allows us to represent the relationship between those two variables in a two-dimensional graph (at specific levels of the variables held constant). To accomplish this goal, we can simply hold the other two independent variables constant at their respective levels and rewrite the equation. In economic writing, this “holding constant

Original toplevel document

3.1. The Demand Function and the Demand Curve
ld weekly consumption would decrease by 0.4 gallons for every dollar increase in gas price. Own-price is used by economists to underscore that the reference is to the price of a good itself and not the price of some other good. <span>In our example, there are three independent variables in the demand function, and one dependent variable. If any one of the independent variables changes, so does the value of quantity demanded. It is often desirable to concentrate on the relationship between the dependent variable and just one of the independent variables at a time, which allows us to represent the relationship between those two variables in a two-dimensional graph (at specific levels of the variables held constant). To accomplish this goal, we can simply hold the other two independent variables constant at their respective levels and rewrite the equation. In economic writing, this “holding constant” of the values of all variables except those being discussed is traditionally referred to by the Latin phrase ceteris paribus (literally, “all other things being equal” in the sense of “unchanged”). In this reading, we will use the phrase “holding all other things constant” as a readily understood equivalent for ceteris paribus. Suppose, for example, that we want to concentrate on the relationship between the quantity demanded of the good and its own-price, P x . Then we would hold constant the val


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