BusinessWeek Online – While consumers, politicians and pundits debated the Bush administration’s plan to help subprime borrowers that was unveiled on Dec. 6, investors piled into beaten-down homebuilder stocks. Shares of Toll Brothers , which reported fourth-quarter results before the market opened, jumped 13%, to $23.42, while Lennar rose 15%, to $18.73; KB Home surged 16%, to $24.25; and Centex moved up nearly 13%, to $25.18.