The study looked at how changes in tuition fees affect college enrollment. They used a model to see the overall impact on the economy, not just on individuals. They found that the effects of tuition on college enrollment are much smaller when considering the whole economy compared to just looking at individual cases. This means that the way we usually estimate the impact of tuition changes might not be accurate when looking at the bigger picture. The study suggests that policy changes can have complex effects that go both ways, and we need to consider all the consequences when evaluating programs.