War and pestilence as labor market shocks

"This paper explores the effect of mortalities from the 1918-1919 influenza pandemic and World War I on real wage growth in the manufacturing sectors of U.S. states from 1914 to 1919. The general hypothesis is that both events caused a significant decrease in the supply of manufacturing labor, thereby initially increasing the marginal product of labor and thus wages. The empirical results reveal that influenza mortalities led to a greater overall increase in real manufacturing wage growth, but the marginal effect on wage growth from an additional World War I combat mortality was greater than that from the influenza pandemic"--Federal Reserve Bank of St. Louis web site.