Recall the talk before the bust of the "New Economy," in which distended P/E ratios and lack of profits were to be irrelevant. Recall Enron's public proclamations of its stability and projected earnings increases. Keep these in mind as you read The Great Crash, and you will be very, very skeptical of analysts, to say nothing of executives.
Galbraith's theme is that market stability and corporate interests are fundamentally at odds. After pumping up prices by gambling with borrowed money, the financiers and executives simply hope to cash in and make it out alive. In the ensuing crisis, CEOs will never speak evil about their own companies or the condition of the market, so their speech is about as useful to an investor as a pre-game pep talk is to a bettor. Analysts, as well as executives, are salesmen of their own stock, and their primary objective is to get you to buy high.
Galbraith is a talented storyteller, and he highlights themes that are likely to accompany future bubbles so that the reader knows what to be skeptical about. This is a very entertaining read, and if you actively compare what Galbraith tells you of the 20's to what you know about the 90's, you'll likely not be swept away by future investing mania.
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Having learned a thing or two since I wrote that, I can think of no book better suited to explain our current predicament to the layman. Excessive leverage, housing bubble, financial deregulation, and crony capitalism -- sound familiar? You'll read about this stuff happening back in the '20s and shake your head in disbelief.