The Dow Jones Industrial Average (DJIA) is the best known ...

Over time, since 1889 when Dow Jones started the index, the divisor has changed from 12.000 [originally there were only 12 firms in the index, then 20, now 30] to 0.15571590501117 as of 24 Jan 2014). 4) The model, DJIA=Total/divisor, can be rewritten DJIA x divisor = Total. ................
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