Most stock market indexes, except for the very simplest are calculated by actuaries. This is because the calculation must take into account the minute-to-minute trading in the market and accommodate a number of complications such as mergers, acquisitions, share splits and consolidations while at the same time taking into account the company’s “free float”. Thus, the JSE/FTSE Actuaries indexes are monitored constantly by a group of actuaries employed by the JSE. Simpler old indexes like the Dow Jones Industrial index are a simple average of the thirty largest companies trading on Wall Street – not even adjusted for their market capitalisation. To view the JSE actuaries indexes just type “JSE-“ into your software and that will put you at the top of a list of all the JSE Actuaries indexes for all the sectors and sub-sectors on the JSE. These can be useful for comparing with individual shares that you may be interested in, using a comparative relative strength chart.

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