explicit attempts to understand what regions are and why they help us
predict political outcomes have been rare.
In the last 20 years, the study of matching markets has seen great innovations and marked progress. The theory has matured to a point where matching theorists are able to make policy suggestions for real-life markets. The theory is supplemented by experiments examining how to operate such markets. Notable applications are matching markets such as medical labor markets for interns, college admissions procedures, school choice programs, social housing assignments, and kidney exchange programs for patients all over the world.