You're considering the supply side, but not the demand side. If the business major required a certain GPA to stay in, the competition among students could kick

You're considering the supply side, but not the demand side. If the business major required a certain GPA to stay in, the competition among students could kick someone out, especially if grades were calculated on a bell curve. Someone who can't hack it would consistently score lower than their peers in that scenario and not meet the GPA cutoff.