An investor now has the ability to purchase these stocks and take advantage of the market inefficiency.

FORBES: Panning for Stocks

One of them is Robert A. Haugen, a financial economist best known for his pioneering research on market inefficiency.

FORBES: Fiscal Cliff Or Not, Low-Volatility Stocks Tend to Outscore The More Exciting, Highly Volatile Plays Over The Long Haul

Whereas traditional market makers promote price and market efficiency, a firm like Goldman, as an active trader for its own account, can maximize its opportunity for profits by promoting price and market inefficiency.

FORBES: When Does Market Making Become Market Manipulation?

This, if true, suggests a genuine market inefficiency.

ECONOMIST: Buttonwood

In the end anything that creates market inefficiency, whether tipping off favored clients or wild parties that throw business to inefficient brokers, comes out of the pockets of people who provide capital to Wall Street, like pensioners and taxpayers.

FORBES: Magazine Article

The advantage for the hedge funds in the mortgage market lay in the inefficiency of that market and the lack of such fierce competition as existed in the much larger universe of macro hedge funds.

FORBES: As the Fed Buys Mortgages You Should Too

Thus, it's important not to draw the wrong conclusions from the market's inefficiency.

WSJ: Intelligent Investor: Don't Bet the House on Efficient-Market Model

That would only underline the inefficiency of Germany's energy market.

ECONOMIST: German business

It is because the market was opened up to competition after years of inefficiency and price-rigging.

BBC: Q&A: British Energy's crisis

"You get severe inefficiency because airlines can't service the global market, " he said.

CNN: STORY HIGHLIGHTS

Broadcast spectrum inefficiency is a legacy of the days when TV had 100% of the wireless market.

WSJ: A Broadcast Spectrum Gold Mine