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Short-time work (STW) policies provide subsidies for hour reductions to workers in firms experiencing temporary shocks. They are the main policy tool used to support labour hoarding during downturns and were aggressively used during the coronavirus disease 2019 (COVID-19) pandemic. Yet, very little is known about their employment and welfare consequences. This article leverages unique administrative social security data from Italy and quasi-experimental variation in STW policy rules to offer evidence on the effects of STW on firms' and workers' outcomes during the Great Recession. Our results show large and significant negative effects of STW treatment on hours, but large and positive effects on headcount employment. We then analyse whether these positive employment effects are welfare enhancing, distinguishing between temporary and more persistent shocks. We first provide evidence that liquidity constraints and rigidities in wages and hours may make labour hoarding inefficiently low without STW. Then, we show that adverse selection of low productivity firms into STW reduces the long-run insurance value of the program and creates significant negative reallocation effects when the shock is persistent. [ABSTRACT FROM AUTHOR]

What is the most efficient way to respond to recessions in the labor market? To this question, policymakers on the two sides of the pond gave diametrically opposed answers during the COVID-19 crisis. In the United States, the focus was on insuring workers by increasing the generosity of unemployment insurance. In Europe, instead, policies were concentrated on saving jobs, with the expansion of short-time work programs to subsidize labor hoarding. Who got it right? In this article, we show that far from being substitutes, unemployment insurance and short-time work exhibit strong complementarities. They provide insurance to different types of workers and against different types of shocks. Short-time work can be effective at reducing socially costly layoffs against large temporary shocks, but it is less effective against more persistent shocks that require reallocation across firms and sectors. We conclude that short-time work is an important addition to the labor market policy-toolkit during recessions, to be used alongside unemployment insurance. [ABSTRACT FROM AUTHOR]