This could include employing dollar-cost averaging or automatically rebalancing your portfolio when particular asset classes gain or lose value in comparison to others.

FORBES: The Irresistible Nature of Trading

That made the value shares look very cheap by comparison and created the conditions for an extended period of catching up.

ECONOMIST: Looking for growth stocks when there is not much growth

With their stocks down, health care REITs are cheap in comparison with the estimated liquidating value of their assets.

FORBES: Magazine Article

Most country funds, like other index funds, are market-weighted, meaning their exposure to different stocks is based on the total value of the stocks' shares outstanding in comparison with the market capitalization of other shares in that market.

WSJ: Single-Country ETFs: Risky Ventures

The Internet shifts the bargaining power from sellers to consumers through comparison-shopping that lets consumers get better value per dollar spent Black Friday online transactions increased by 30 percent, while the average price per ticket was down 11 percent, according to Chasepaymentech.

FORBES: 5+1 Big Winners of Black Friday Sales Online

Angrisani also saw value of one of Greenfield's acquisitions, Ciao, a European price comparison company.

FORBES: Magazine Article

No doubt, Keiter realizes the competition in comparison shopping is fierce and that, to thrive, he needs a compelling value proposition.

FORBES: Taking On The Comparison Shopping Gorillas

See Figure 1 for a comparison of both variants of Case-Shiller and their corresponding analogues based on the Zillow Home Value Index.

FORBES: Zillow Forecasts Tomorrow's Case-Shiller Report to Show 4% Yearly Decline, 1.2% Monthly Increase