I love the concept of the predictive power of
futures markets- a market where people get together to buy and sell securities based on an underlying commodity, or product. There are two types of players in these markets, the Hedgers and the Speculators. Despite the bad rap that Speculators often get, both are legitimate, even necessary components of the market. The Hedgers have an underlying business and use futures to eliminate the risks of outside factors (like interest rates, or foreign exchange rates, or jet fuel costs) on that business. The Speculators make their business to profit purely from the moves of the market itself. The Speculators provide liquidity for the Hedgers- there's always someone there to buy the risk I'm selling, at the right price.
It is this 'right price' that makes the predictive power of the market so compelling. You get enough people with enough detailed knowledge and vested interest and the market price quickly illustrates itself a model of efficiency. (I'm sure you've heard the predictive-accuracy stories about the Iowa markets for things like political races.)
For a long time I've thought a housing price futures market could be compelling. There's no real way to hedge you home asset value. No futures market predicting home prices moves. Well now there is...