The emergence of nonpracticing entities (NPEs) — firms that purchase and hold patent rights but neither innovate themselves nor use the patents in the production of goods — is supposed to incentivize innovation by providing a ready market for innovators. We test this idea empirically and...

Industry concentration has been rising in the US since 1980. Does this signal declining competition and need for a new antitrust policy? Or are other factors causing concentration to rise? This paper explores the role of proprietary information technology (IT), which could increase the...

Will new technologies cause industries to shed jobs, requiring novel policies to address mass unemployment? Sometimes productivity-enhancing technology increases industry employment instead. In manufacturing, jobs grew along with productivity for a century or more; only later did productivity...

We provide the first estimate of the impacts of automation on individual workers by combining Dutch micro-data with a direct measure of automation expenditures covering firms in all private non-financial industries over 2000-2016. Using an event study differences-indifferences design, we find...

We use detailed data to estimate the private costs and private rents of United States patents for publicly-traded firms. In analyzing costs, we first introduce a novel theoretical model to interpret our estimates. We then combine lawsuit data from Derwent Litalert with non-practicing entity...

In manufacturing, technology has sharply reduced jobs in recent decades. But before that, for over a century, employment grew, even in industries experiencing rapid technological change. What changed? Demand was highly elastic at first and then became inelastic. The effect of artificial...

Recent research finds that markups are rising, suggesting declining competition. But does less price competition mean less Schumpeterian “creative destruction”/industry dynamism? This paper reports the first recent estimates of trends in the displacement of industry-leading firms....

Since 1980, US corporate valuations have risen relative to assets and operating margins have grown. The possibility of sustained economic rents has raised concerns about economic dynamism and inequality. But rising profits could come from political rents or, instead, from returns to investments...

Artificial intelligence (AI) technologies will automate many jobs, but the effect on employment is not obvious. In manufacturing, technology has sharply reduced jobs in recent decades. But before that, for over a century, employment grew, even in industries experiencing rapid technological...

How much of the rapid growth in labor productivity in nineteenth century cotton weaving arose from capital-labor substitution and how much from technical change? Using an engineering production function and detailed information on inventions, I find that factor substitution accounts for little...