The human capital of young and old workers are imperfect substitutes both in production and in on-the-job training. This helps explain why capital does not flow from rich to poor countries, causing instantaneous convergence of per capita output. If each generation chooses its human capital...

We review economic arguments for using public policy to accelerate vaccine supply during a pandemic. Rapidly vaccinating a large share of the global population helps avoid economic, mortality, and social losses, which in the case of Covid-19 mounted into trillions of dollars. However,...

This study exploits a randomized school health intervention that provided deworming treatment to Kenyan children and utilizes longitudinal data to estimate impacts on economic outcomes up to 20 years later. The effective respondent tracking rate was 84%. Individuals who received 2 to 3...

John Ford and Alfred Hitchcock were experimental filmmakers: both believed images were more important to movies than words, and considered movies a form of entertainment. Their styles developed gradually over long careers, and both made the films that are generally considered their greatest...

Frank Lloyd Wright, Le Corbusier, and Frank Gehry were experimental architects: all worked visually, and arrived at their designs by discovering forms as they sketched. Their styles evolved gradually over long periods, and all three produced the buildings that are generally considered their...

Psychologists have not considered wisdom and creativity to be closely associated. This reflects their failure to recognize that creativity is not exclusively the result of bold discoveries by young conceptual innovators. Important advances can equally be made by older, experimental innovators....

In 1958, the French philosopher Etienne Gilson observed that "painters are related to manual laborers by a deep-rooted affinity that nothing can eliminate," because painting was the one art in which the person who conceives the work is also necessarily the person who executes it. Conceptual...