And those are the least of the Dow's problems. More troubling is that it ignores the overall size of companies and pays attention to only their share prices. This causes all sorts of oddities. ExxonMobil, for example, divides its value into nearly five billion lower-cost shares, while Caterpillar has around 650 million more expensive ones. Therefore ExxonMobil, one of the largest companies in history, pulls less weight on the Dow than a company less than a fifth its size.
The computation of the Dow is flawed. Read the whole thing to see why.
It is useful, though, to manage perceptions that the economy is flourishing even though it isn't.
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