When I Einhorn calls AMZN/TSLA 'bubble stocks' he is being reckless in my view. A better name is 'genius stocks'.
In these genius stocks whats matter is not necessarly what you can see in the balance sheet, cash flows, etc, what matters is the chance that the person running it is actually a genius. Look at BRKB, early on, they had a certain amount of cash on hand/capital to invest. You could look at Buffett/Munger and think there was a certain amount of value of having that capital in their hands. But because they are geniuses, that value increased over the years as they 'innovated' on capital deployment. Two major ways where:
-Buffett 'created' a new source of capital/cash, namely by acquiring insurance companies that were well managed. This gave BRK float that they could invest, enhancing returns. This produced an exponential payoff to BRKB shareholders, even the ones who seemed to be paying too high a price for the stock sometimes.
-Munger 'inovated' with his theory of 'its better to buy a great business at a fair price than an ok/bad business at a cheap price'. This produces larger exponential investments returns due deferral of tax payments plus all the innovations of that great business (a genius can recognize another genius or semi-genius and the compounding effect can be enhanced further)
These 'assets' (namely, the innovations on capital allocation) were not in the balance sheet and didn't show up anywhere on BRK back in the day, its what Ackman calls 'platform value'. Yet, if someone recognized that genius early on, they could have invested in BRK knowing that a genius allocating their capital was going to do a better job than themselves.
That's why, I believe, TSLA trades like it does. There is nothing in the balance sheet, cashflows that justify the price, except that there is a certain chance that Musk is actually a genius and TSLA shares are a fraction ownership of cashflows from his car/solar innovations. Heck, its possible that even Musk doesn't know what he can discover/innovate on/produce down the line, its possible that he will be the one who will mass produce self-driving cars in 10 years and flying cars in 20-30 (and looking at how quickly drones are being developed, this might not seem so crazy), just like Munger and Buffett didn't know what they discovered later. And if even Musk doesn't know, how can an analyst or some asshole doing DCF analysis know? When these innovations happen, the payoff is gigantic/exponential. This means that longs don't have to be right very often to be making a good bet
But there is more, because longs can monitor these geniuses and their business decisions, they can ALWAYS sell when it looks like that thesis is broken (guy turns out to not be so smart, dies, goes crazy, etc). So you are not risking 100% of your money (you dont have to ride to $0), you can sell at -30%, -40%, -50% and cap your loss. This creates an even better payoff to risk ratio. Effectively, longs get paid 10-1, 50-1, 500-1 to be making these bets and shorts take the other side. Who is smarter?