As the most reckless players are today taking “genius” laps on the back of stock prices which have once more reclaimed the rare distinction of being the most most leveraged and over-valued in history next to 1929 and 2000, it is helpful to consider a little reminder on how speculative markets break: suddenly and all at once. Even the few participants today that feel confident that they have downside protection by using stop loss limits are likely to learn that once prices gap down, stops are often impotent.
“…it is the nature of a speculative boom that almost anything can collapse it. Any serious shock to confidence can cause sales by those speculators who have always hoped to get out before the final collapse, but after all possible gains from rising prices have been reaped. Their pessimism will infect the simpler souls who had thought the market might go up forever but who now will change their minds and sell. Soon there will be margin calls, and still others will be forced to sell. So the bubble breaks.” –John Kenneth Galbraith, (1954) The Great Crash 1929