Suppose your claim is true. Suppose in other words that it would be impossible to sell all the FB shares at the current closing price. How would that be an argument against the usefulness of comparing Twitter&#x27;s market cap to FB&#x27;s?<p>No one has ever bought a company whose market cap is as big as FB&#x27;s currently is -- let alone bought one for cash. But publicly-traded companies with caps in the billions have been bought in all-cash transactions, and the experience there is that the buyer usually ends up paying more than the market cap right before the investing public starts to become aware of the attempt to buy the company. But <i>even if that were not true</i>, what relevance would it have for whether or not it is a good idea to use market-cap data to compare publicly-traded companies and their products and strategies?<p>Does market cap not remain a good estimate of the future expected earnings of the company?