As a society, we can and should invest more money in education. But that is only part of the solution. The high costs of high-quality education put it off limits to large parts of the population, both in the United States and abroad, and threaten the school’s place in society as a whole. We need to significantly reduce those costs while at the same time improving quality. (Daphne Koller is one of the founders of Coursera, an online education platform.)