Home builders are ramping up speculative construction to attract last-minute home buyers who want to tap a soon-to-expire tax credit.

The strategy is risky. If the buyers don't materialize, builders could be saddled with unsold homes that will require heavy discounting to sell, hurting profits and slowing the housing recovery. New homes may also continue to lose market share to lower-priced foreclosed houses.

Indeed, some economists expect an avalanche of foreclosures in the months ahead as lenders release homes they have been keeping off the market.

Wall Street Journal