The labor share fluctuation has been widely scrutinized recently. Is the labor share of income falling as many have argued over the last few years? How do we measure labor income when the economy is populated with those self-employed? What are the consequences of falling labor income? Rising inequality? Widespread adoption of robots? There are many methodological as well as empirical discussion to be addressed regarding how to measure labor income share and the cause and consequence of changing labor income share over time. This project bravely titled “the labor income share and fluctuations” attempts to clarify some recent research on the related topic and analyzes the changing trend in the labor share in South Korea. Specifically, in Chapter 1, Facundo Piguillem reviews the rich literature on the labor share over the last thirty years. He carefully examines the dispute over the fact that the labor share is globally declining, chronically reviewing the calculation of labor share, the