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What does it mean for a company to have its market cap larger than the market size?
A company's valuation includes its assets, in addition to projected earnings. Aside from the obvious issue that "projected earnings" can be wildly inaccurate or speculative (as in the case of startups and fast-moving industries like technology), a company's assets are not necessarily tied to the market the company is in. For the sake of illustration, say the government were to ban fast food tomorrow, and the market for that were to go all the way to zero.  McDonald's would still have almost 30 billion dollars worth of real estate holdings that would surely make the company worth something, even though it would have to stop selling its products. Similarly, Apple is sitting on approximately $200 billion dollars in cash and securities in overseas subsidiaries.  Even if they never make another cent selling iPhones and such, the company is still worth a lot because of those holdings. "Corporate raiders" back in the 70's and 80's made massive personal fortunes exploiting this disconnect in undervalued companies that had more assets than their market cap, by getting enough ownership to liquidate the company's assets.  Oliver Stone even made a movie about the phenomenon. So yes, it's certainly possible for a company to be worth more than the size of the market for its products.