Yahoo’s resistance to a takeover by Microsoft looks foolhardy to some investors and Wall Street analysts. But the push-back may prove effective in the end—at least by forcing the suitor to cough up a few more bucks a share. Executives from Yahoo (YHOO) on Apr. 7 reiterated the reasons for their opposition. The $31-a-share offer, made public Feb. 1, "substantially undervalues" Yahoo, and its stock component is even less attractive in light of Microsoft’s (MSFT) slumping share price. "We have continued to launch new products and to take actions which leverage our scale, technology, people, and platforms as we execute on the strategy we publicly articulated," Yahoo Chief Executive Jerry Yang and Chairman Roy Bostock wrote.