The argument between <i>spolsky</i> and <i>dhh</i> is funny but ultimately they seem to not be talking about the same thing. They are both right, but one is more right than the other.<p>Joel is talking about market value.<p>What Joel is saying is "dude, you don't understand value. Value is what people are willing to pay for. If someone - just one person - is willing to pay $100 for a millionth of a broken piece of crap, then that broken piece of crap is worth a hundred million dollars, <i>your opinion of it notwithstanding</i>".<p>He's right. Technically.<p>But David does not care about market value (although he tries to attack it and picturing it as not real). David is talking about <i>intrinsic value</i>; he's saying: "this thing has 500 million users, and that's amazing. But they don't make much money out of all those users, let alone any profit. So if we try to estimate the present value by actualizing future cash flows, we find the real price should be... well, not much".<p>He's also right. And I think he's fundamentally right.<p>During the housing bubble, some people (Peter Schiff for example, or the heroes of <i>The Big Short</i>) argued that the real value of housing was a multiple of rent (10-15 times rent), and that anything above that was crazy.<p>At the time, they were wrong -- they were very wrong; the value of a house was the market price, not the "intrinsic" price. The value of anything is always the market price.<p>But then suddenly there is no market. The bubble bursts and nobody's buying.<p>In that situation, if you're selling you don't have many options; but if you're buying how do you calculate a price at which you'd be willing to buy, and a price at which you may convince a seller to sell?<p>- - -<p>In a sellers' market (Joel's market) prices are fair because people accept them. If everyone wants a piece of Facebook at any price, just because they have to have it, then, well, the value of Facebook is infinite. It's not 33 billion dollars: it's the whole amount of dollars in the universe, plus one.<p>But this situation never lasts. There has to be a time when Facebook will be out of fashion, and someone will have to ask what is the intrinsic value of this thing.<p>The intrinsic value is hard to compute because you need to actually know how the company makes money, you need to understand its operations, its cost structure, strategy, etc. That's hard work for a public company; it's almost impossible, from the outside, for a private company.<p>But one thing is certain: the intrinsic value of Facebook is not infinite.<p>And then and there, David has a point.