Think less about what to buy, and more about how much
hear a professional investor talk about a trade that taught them a lot, prick up your ears. Usually, this is code for “a time I lost an absolutely colossal amount of money”, and you are in for one of the better stories about how finance works at the coalface.
Now, along with his present-day colleague James White, he has written a book that aims to spare other investors his mistakes. Fortunately, “The Missing Billionaires” is not a discussion of the minutiae of’s bond-arbitrage trades. Instead, it examines what its authors argue is a much more important—and neglected—question than picking the right investments to buy or sell: not “what” but “how much”.
A list of the coin-flippers’ mistakes reads like a parable of how not to invest in the stockmarket. Rather than picking a strategy and sticking to it, subjects bet erratically. Nearly a third wagered their entire pot on a single flip and, amazingly, some did so on the 40% chance of getting tails. Many doubled down on losses, even though doing so is a reliable way of making mild ones catastrophic.
The authors’ great success is in offering a consistent and explicit framework within which to do all this. At its core is the concept of “expected utility”, or the pleasure derived from a given level of wealth. This accounts for the fact that most people are averse to risking large chunks of their capital.
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