A simple, yet troubling rule of thumb drives enrollment to community colleges, for-profit colleges, and some four-year open-access institutions. As reported by Inside Higher Ed, employment and unemployment rates drive spikes in enrollment at these institutions, and play a much greater correlation than other population trends. It's a logical and consistent link: when unemployment rises, so do enrollments to community colleges. This is due to the fact that when people of low-income become unemployed, they are freed up to invest their time in higher education. When unemployment is down, low-income students do not have the luxury to go to school, because they have immediate monetary needs, and must go to work while employment is an option.