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ETF Specialist

The Trouble With Market-Cap-Weighting

Market-cap weighting is often a good choice for indexing, but in some markets it may compromise diversification.

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The stock market, like any other market, is simply the sum of all transactions for shares of publicly listed companies, millions of which are conducted every day. Hour by hour, minute by minute, Benjamin Graham's voting machine is hard at work as market participants express their opinions regarding a company's future prospects through the price at which its shares transact.

In a rational world, these opinions and the ensuing actions are based on an investor's knowledge and understanding of these firms. New information is combined with old, and prices fluctuate through a continuous auctionlike process.

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Daniel Sotiroff does not own shares in any of the securities mentioned above. Find out about Morningstar’s editorial policies.