Abstract: In response to the COVID-19 lockdown policies, Guerrieri et al. (2020) developed a new concept: the Keynesian supply shock. A Keynesian supply shock is an aggregate supply shock that leads to an even larger aggregate demand shock. This paper suggests that Keynesian supply shocks are very similar to the secondary deflations suggested by Hayek (1931), and US data from the 2007–09 financial crisis show that these concepts may help to explain employment dynamics in the midst of a crisis. This fact implies that long-standing policy advice based on Austrian business cycle theory would be useful in responding to Keynesian supply shocks.