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AbstractWe study the determinants of lifetime earnings (LE) inequality in the United States, for which differences in lifetime earnings growth are key. Using administrative data and focusing on the roles of job ladder dynamics and on-the-job learning, we document that 1) lower LE workers change jobs more often, mainly driven by higher nonemployment; 2) earnings growth for job stayers is similar at around 2 percent in the bottom two-thirds of the LE distribution, whereas for job switchers it rises with LE; and 3) top LE workers enjoy high earnings growth regardless of job switching. We estimate a job ladder model with on-the-job learning featuring ex ante heterogeneity in learning ability and job ladder risk-job loss, job finding, and contact rates. We find that learning ability differences explain almost all earnings growth heterogeneity above the median, whereas ex ante heterogeneity in job ladder risk accounts for 80 percent of LE growth differences below the median.1 Next, we investigate average earnings growth for job stayers and switchers across the LE distribution. We find that average growth for job stayers is surprisingly similar at around 2% in the bottom two thirds of the LE distribution, and increases steeply in the top tercile, reaching around 10% at the top quantile of the LE distribution. As for the average earnings growth of job switchers, we find much larger heterogeneity across the LE quantiles: It rises almost linearly from zero for the bottom LE quantile to around 4% for the 90th percentile, after which it accelerates to 10% for the top LE individuals. This large heterogeneity indicates that the nature of job switches is very different throughout the LE distribution. In fact, we argue that more than 35% of job switches are a result of a significant unemployment spell for bottom LE individuals, compared to only around 15% for the 90th percentile workers. These facts imply that differences in lifetime earnings growth in the bottom half of the LE distribution are coming from growth differences of job switchers, whereas stayer growth differences should be the main culprit in the upper half, as high LE workers rarely switch employers. Building on this intuition, we develop a structural model to disentangle the economic forces that shape the distributions of the earnings growth of job stayers and switchers across the LE distribution. Specifically, we estimate a job ladder model with two-sided heterogeneity in the spirit of Cahuc et al. (2006) ...