With the economy forcing budget cuts and layoffs in higher education, colleges and universities might be expected to be cutting financial aid. But no. Students considering a wide range of private schools, as well as those who are already enrolled, can expect to get more aid this year, not less. The increases highlight the hand-to-mouth existence of many of the nation’s smaller and less well-known institutions. With only tiny endowments, they need full enrollment to survive, and they are anxious to prevent top students from going elsewhere.