From the new NBER working paper by Justin Caron, Thibault Fally and James Markusen, "Per Capita Income and the Demand for Skills,"
Almost all of the literature about the growth of income inequality and the relationship between skilled and unskilled wages approaches the issue from the production side of general equilibrium (skill-biased technical change, international trade). Here, we add a role for income-dependent demand interacted with factor intensities in production. We explore how income growth and trade liberalization influence the demand for skilled labor when preferences are non-homothetic and income-elastic goods are more intensive in skilled labor, an empirical regularity documented in Caron, Fally and Markusen (2014). In one experiment, counterfactual simulations show that sector neutral productivity growth, which generates shifts in consumption towards skill-intensive goods, leads to significant increases in the skill premium: in developing countries, a one percent increase in productivity leads to a 0.1 to 0.25 percent increase in the skill premium. In several countries, including China and India, simulations suggest that the historical growth experienced in the last 25 years may have led to an increase in the skill premium of more than 10%. In a second experiment, we show that trade cost reductions generate quantitatively very different outcomes once we account for non- homothetic preferences. These imply substantially less predicted net factor content of trade and allow for a shift in consumption patterns caused by trade-induced income growth. Overall, the negative effect of trade cost reductions on the skill premium predicted for developing countries under homothetic preferences (Stolper-Samuelson) is strongly mitigated, and sometimes reversed.
Or to put in other words:
We provide a quantitative assessment of a simple yet overlooked mechanism: growth in income increasingly shifts consumption patterns towards goods and services that require relatively more skilled labor in their production.
Read more here. (Gated)
Income inequality has been increasing but so has consumption according to a working paper by Bruce Sacerdote of Dartmouth College.
Extract:
Despite the large increase in U.S. income inequality, consumption for families at the 25th and 50th percentiles of income has grown steadily over the time period 1960-2015. The number of cars per household with below median income has doubled since 1980 and the number of bedrooms per household has grown 10 percent despite decreases in household size. The finding of zero growth in American real wages since the 1970s is driven in part by the choice of the CPI-U as the price deflator (Broda and Weinstein 2008). Small biases in any price deflator compound over long periods of time. Using a different deflator such as the Personal Consumption Expenditures index (PCE) yields modest growth in real wages and in median household incomes throughout the time period. Accounting for the Hamilton (1998) and Costa (2001) estimates of CPI bias yields estimated wage growth of 1 percent per year during 1975-2015. Meaningful growth in consumption for below median income families has occurred even in a prolonged period of increasing income inequality, increasing consumption inequality and a decreasing share of national income accruing to labor.
Link: Fifty Years Of Growth In American Consumption, Income, And Wages - 61497-w23292.pdf
