That is the marketing and economics lecture about Total Available Market (TAM). If Ford decided to build a Corvette competitor, they would have to find enough people to sell them to to make it worth while. There are two ways: 1. Make a product that noone else builds and make a new market, or 2. Obtain market share from a competitor. A Corvette competitor would be #2 (as is, by the way, the New Ford GT). The basic premise is that situation 2 is "entropic" - that is, market can neither be created nor destroyed. Like air in a balloon you can shift it around but the amount of air is still fixed. Thus it would be with Corvette. For the market share that Ford could "steal" from the very loyal Corvette market, Ford decided they couldn't compete on volume.