Mismatch Unemployment
构建了一个框架，衡量不同部门间职位空缺与求职者错配对失业率的影响，发现错配最多解释美国近期失业率上升的三分之一，职业错配对大学毕业生影响更大，地理错配作用不明显。
We develop a framework where mismatch between vacancies and job seekers across sectors translates into higher unemployment by lowering the aggregate job-finding rate. We use this framework to measure the contribution of mismatch to the recent rise in US unemployment by exploiting two sources of cross-sectional data on vacancies, JOLTS and HWOL. Our calculations indicate that mismatch, across industries and three-digit occupations, explains at most one-third of the total observed increase in the unemployment rate. Occupational mismatch has become especially more severe for college graduates, and in the West of the United States. Geographical mismatch unemployment plays no apparent role.