Theoretical Dow Jones Index

DEFINITION of 'Theoretical Dow Jones Index'

A method of calculating a Dow Jones index (most often the DJIA) that assumes all index components hit their high or low at the same time during the day.

BREAKING DOWN 'Theoretical Dow Jones Index'

In other words, the "theoretical Dow" uses the daily highs for all 30 Dow components to calculate the index high, and the lows to calculate the index low. In January of 1992, Dow Jones started using the "actual" method, which calculates the index at 10-second intervals throughout the day. Before this point, the theoretical calculation was the only way to compute the high and low of the index.

This method assumes that all stocks hit their high or low at the same time. Because this rarely happens, the theoretical high will almost always be higher than the actual, and the theoretical low will almost always be lower than the actual.

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