In response to the downturn in the state economy, Lafayette College will reduce its operating budget by $11 million, or roughly 10 percent, over the next four fiscal years, according to a memo sent to faculty, staff and students this week. "In order to maintain the quality of our academic programs, we must stay ahead of the challenges we face and make necessary cost adjustments over a three- to four-year budgeting horizon," college president Daniel H. Weiss said in the Wednesday memo.