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Working Paper
Technology Adoption, Mortality, and Population Dynamics
We develop a quantitative theory of mortality trends and population dynamics. We emphasize diseases as causes of death and individuals' decisions to reduce their mortality by adopting, at some cost, a modern health-related technology. Adoption confers a dynamic externality: Adoption becomes cheaper as more individuals acquire the modern technology. Our model generates an S-shaped diffusion curve, whose shape dictates the pace of mortality reduction in each country. We use the model to explain the gradual decline of mortality in Western Europe in the 19th and 20th centuries as well as the ...
Working Paper
The UK Productivity “Puzzle” in an International Comparative Perspective
The UK’s slow productivity growth since 2007 has been referred to as a “puzzle”, as if it were a particularly UK-specific challenge. In this paper, we highlight how the United States and northern Europe experienced very similar slowdowns. The common slowdown in productivity growth was a slowdown in total factor productivity (TFP) growth; we find little evidence that capital deepening was an important independent factor. From a conditional-convergence perspective, most of the UK slowdown follows from the slowdown at the U.S. frontier. From the mid-1980s to 2007, the UK’s relative ...
Working Paper
Technology Adoption, Mortality, and Population Dynamics
We develop a quantitative theory of mortality and population dynamics. We emphasize individuals' decisions to reduce their mortality by adopting better health technology. Adoption confers a dynamic externality: Adoption becomes cheaper as more individuals use better technology. Our model generates a diffusion curve, whose shape dictates the pace of mortality reduction. The model explains historical trends in mortality rates and life expectancies at various ages, and population dynamics in Western Europe. Unlike Malthusian theories based solely on income, ours is consistent with the observed ...
Working Paper
The Productivity Slowdown in Advanced Economies: Common Shocks or Common Trends?
This paper reviews advanced-economy productivity developments in recent decades. We focus primarily on the facts about, and explanations for, the mid-2000s labor-productivity slowdown in large European countries and the United States. Slower total factor productivity growth was the proximate cause of the slowdown. This conclusion is robust to measurement challenges including the role of intangible assets, rankings of productivity levels, and data revisions. We contrast two main narratives for the stagnating productivity frontier: The shock of the Global Financial Crisis; and a common slowdown ...
Working Paper
Technology Adoption, Mortality, and Population Dynamics
We develop a quantitative theory of mortality and population dynamics. We emphasize individuals' decisions to reduce their mortality by adopting better health technology. Adoption confers a dynamic externality: Adoption becomes cheaper as more individuals use better technology. Our model generates a diffusion curve, whose shape dictates the pace of mortality reduction. The model explains historical trends in mortality rates and life expectancies at various ages, and population in Western Europe. Unlike Malthusian theories based solely on income, ours is consistent with the observed disconnect ...
Working Paper
Technology Adoption, Mortality, and Population Dynamics
We develop a quantitative theory of mortality and population dynamics. We emphasize individuals' decisions to reduce their mortality by adopting better health technology. Adoption becomes cheaper as more individuals use better technology. It also confers a dynamic externality by increasing the future number of individuals who use the better technology. Our model generates a diffusion curve whose shape dictates the pace of mortality reduction. The model explains historical trends in mortality rates and life expectancies at various ages and population dynamics in Western Europe. Unlike ...
Working Paper
Convergence to Rational Expectations in Learning Models: A Note of Caution
This paper illustrates a challenge in analyzing the learning algorithms resulting in second-order difference equations. We show in a simple monetary model that the learning dynamics do not converge to the rational expectations monetary steady state. We then show that to guarantee convergence, the gain parameter used in the learning rule has to be restricted based on economic fundamentals in the monetary model.
Working Paper
Convergence to Rational Expectations in Learning Models: A Note of Caution
This paper illustrates a challenge in analyzing the learning algorithms resulting in second-order difference equations. We show in a simple monetary model that the learning dynamics do not converge to the rational expectations monetary steady state. We then show that to guarantee convergence, the gain parameter used in the learning rule has to be restricted based on economic fundamentals in the monetary model.
Working Paper
Technology Adoption, Mortality, and Population Dynamics
We develop a quantitative theory of mortality and population dynamics. We emphasize individuals' decisions to reduce their mortality by adopting better health technology. Adoption confers a dynamic externality: Adoption becomes cheaper as more individuals use better technology. Our model generates a diffusion curve, whose shape dictates the pace of mortality reduction. The model explains historical trends in mortality rates and life expectancies at various ages, and population dynamics in Western Europe. Unlike Malthusian theories based solely on income, ours is consistent with the observed ...