Based on the estimates of Ghose and Han (2014), the demand function for mobile applications at Apple’s App Store is QA = 1.4p-2 and the demand function at Google Play is 1.4p-3.7, where the quantity is in millions of apps. What is the total demand function for apps? If the price for an app is $1, what is the equilibrium quantity demanded by Apple customers, Google customers, and all customers? (Hint: Look at the Application “Aggregating Corn Demand Curves.”)

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Market Surplus and Shortage Analysis

In everyday language, a “surplus” indicates that there is an excess of something, while a “shortage” means that there is a scarcity of it. In economics, “market surplus” refers to the condition where the quantity of a certain good more available than what is required or “demanded” by the market. In the same way, a “market shortage” refers to the condition where the quantity of a certain good is less available than what is “demanded” by the market. If quantity in demand is written as Qd and quantity that is supplied is written as Qs, then, the condition Qs > Qd indicates market surplus and condition Qd > Qs indicates market shortage.