
A total return index is an index that measures the performance of a group of components by assuming that all cash distributions are reinvested, in addition to tracking the components` price movements. While it is common to refer to equity based indices, there are also total return indices for bonds and commodities. A total return index (TRI) is d....
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http://en.wikipedia.org/wiki/Total_return_index

An index that calculates the performance of a group of stocks assuming that dividends are re-invested into the index constituents. For the purposes of the index calculation, the value of the dividends are re-invested in the index on the ex-dividend date.
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http://www.exchange-handbook.co.uk/index.cfm?section=glossary&first_letter=
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