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D I S C U S S I O N P A P E R S E R I EIZA Discussion Papers often represent preliminary work and are circulated to encourage discussion. Citation of such a paper should account for its provisional character. A revised version may be available directly from the author.IZA Discussion Paper No. 10265 October 2016
ABSTRACTFrictional Unemployment with Stochastic Bubbles * Bubbles are recurrent events, which contribute to both macroeconomic and employment volatility. We introduce stochastic bubbles in the standard search-and matching model of the labor market. The economy alternates between latent and bubbly states, each being associated with a distinct solution for the market value of firms (respectively, stable or explosive). Bubbles in firm value induce distortions in hiring decisions and wages, which we explicitly characterize. Faced with bubbles, the social planner optimally deviates from the standard Hosios efficiency condition. The optimal share of workers in total surplus must be above the elasticity of hiring rates, by a small but increasing amount as the bubble expands. Finally, our specification for bubbles significantly improves the quantitative ability of the model to match U.S. data, along both real and financial dimensions. . The repeated rise and fall of firm market values can hardly be attributed only to technological innovations. Instead, these episodes are often described as economy-wide changes in beliefs, and referred to as "bubbles".The connection between financial fluctuations and employment is important but still lacks a consensus. We focus here on bubbles as an alternative source of financial fluctuations. As we document in the text, bubbly episodes strongly correlate with fluctuations in labor ma...