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We build a model of …rm-level innovation, productivity growth and reallocation featuring endogenous entry and exit. A key feature is the selection between highand low-type …rms, which di¤er in terms(More)
Human JC polyomavirus (JCV) is the etiologic agent of the neurodegenerative disease progressive mulifocal leukoencephalopathy. By using JCV as a model, we investigated the role of the viral early(More)