But, as usual, Robert Reich has a perceptive take:
Giant high-speed computers generate millions of trades based on instructions embedded in computer programs designed to move so fast they beat everyone else. So when there’s a glitch in one of them, it can immediately spread to all the other programs designed to move just as fast. Some say it was an erroneous trade entered by someone at a big Wall Street bank who mistyped an order to sell a large block of stock — and the big drop in that stock’s price (Procter & Gamble?) triggered “sell” orders across the market.
Regardless of why it happened, it’s further evidence that the nation’s and the world’s capital markets have become an out-of-control casino in which fortunes can be made or lost in an instant — which would be fine except for the fact that most of us have put our life savings there. Pension funds, mutual funds, school endowments — the value of all of this depends on a mechanism that can lose a trillion dollars in minutes without anyone having a clear idea why. So much of the market now depends on computer programs and mathematical models that no one fully understands, so much trading is done by people whose momentary carelessness could sink the economy, so much of global wealth now depends on who can move their money quickest at the slightest provocation — that we are toying with financial disaster every day.