Richard Burkhauser of Cornell University talks with EconTalk host Russ Roberts about the state of the middle class. Drawing on recently published papers, Burkhauser shows that changes in the standard of living of the middle class and other parts of the income distribution are extremely sensitive to various assumptions about how income is defined as well as whether you look at tax units or households. He shows that under one set of assumptions, there has been no change in median income, but under a different and equally reasonable set of assumptions, median income has grown 36%. Burkhauser explains how different assumptions can lead to such different results and argues that the assumptions that lead to the larger growth figure are more appropriate for capturing what has happened over the last 40 years than those that suggest stagnation.