(Bloomberg) -- Iowa’s Grinnell College for years was in an enviable position. Bolstered by Warren Buffett’s guidance decades ago, the tiny liberal arts school has grown its endowment to $2.7 billion, helping fund one of the most generous financial-aid programs in the country.Most Read from BloombergAs Coastline Erodes, One California City Considers ‘Retreat Now’A New Central Park Amenity, Tailored to Its East Harlem NeighborsPower-Hungry Data Centers Are Warming Homes in the NordicsHow a Highway