A Market Cap weighted index is calculated a lot like a school teacher weighs grades. Example: Quiz: 20%
Homework: 20%
Final Paper: 60% So if you got a 80% on your quiz, a 90% on your homework and a 70% on your final your grade would be: 80(.2)+90(.2)+70(.6)= 76% (as compared to 80% without weight) So for a weighted market cap index if you have 3 companies A, B, and C, and each is a different size, then the idea is the largest companies have the largest effect on the total "weighted" result. Conversely the smaller companies will have a smaler effect; in much the same way that your homework matters less than your final in our imaginary school.
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The Restaurant Performance Index (RPI) comes out on the last business day of each month. The Index started in 2002, in order to tracks the health of and the outlook for the U.S. restaurant industry.
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As of July 2014, the market cap for Calamos Convertible and High Income Fund (CHY) is $1,067,796,068.40.