The returns to talent or performance have grown over time in developed countries. Is talent concentrated in a few firms or are firms virtual microcosms of the economy, each having close to identical distributions of talent? The data show that talent is not concentrated in a few companies, but is...

Hiring is positively correlated with separation, both across firms and over time. A theory of hiring and separation based on shifts in demand implies the opposite. One firm or industry hires and grows when another fires and contracts. But hiring for expansion and layoff for contraction comprises...

Most turnover reflects churn, where hires replace departures. Churn varies substantially by employer, industry and worker characteristics. For example, leisure and hospitality turnover is more than double that of manufacturing. In the LEHD (QWI) data, permanent employer differences account for...