We present a new model of competition between digital media platforms with targeted advertising. The model adds new insights around how user heterogeneity and overlap, along with user and advertiser ...

Current technological developments in a number of industries, such as the rise of artificial intelligence and innovations ...

This paper considers why fertility has fallen to historically low levels in virtually all high-income countries. Using cohort data, we document rising childlessness at all observed ages and falling ...

We analyze the effect of California's $20 fast food minimum wage, which was enacted in September 2023 and went into effect in April 2024, on employment in the fast food sector. In unadjusted data from ...

While prior studies of language acquisition have focused on schools, we show the overwhelming influence of out-of-school learning. We identify the causal effect of subtitling in a ...

Fundamental knowledge in the life sciences has consequential implications for medicine and subsequent medical innovations. Using publications in leading life science journals to measure fundamental ...

Lab-in-the-field experiments, in which lab experiments are conducted in more naturalistic settings, are increasingly being implemented in developing country contexts. In this chapter, we outline the ...

During academic year 2024-25, the NBER is providing fellowship support for graduate students studying the economics of aging and health, behavioral macroeconomics, and consumer financial management.

We study the effects of state hospital regulations intended to increase breastfeeding by requiring certain care standards during the postpartum hospital stay. Policy adoption increased breastfeeding ...

In this paper we provide new evidence on the health spillover effects of health shocks within couples. Using administrative data from the Netherlands and a matching event-study framework, we estimate ...

Does industrial concentration shape the life and death of cities? We identify settlements from historical maps of England and Wales (1790–1820), isolate exogenous variation in their late 19th-century ...

We conducted a large-scale field experiment in Granada, Spain, to assess the motivating effect on blood donation of matching each attempt to donate with a charitable contribution pledge for children ...