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Working Paper
BLP Estimation Using Laplace Transformation and Overlapping Simulation Draws
We derive the asymptotic distribution of the parameters of the Berry et al. (1995, BLP) model in a many markets setting which takes into account simulation noise under the assumption of overlapping simulation draws. We show that, as long as the number of simulation draws R and the number of markets T approach infinity, our estimator is ?m = ?min(R,T) consistent and asymptotically normal. We do not impose any relationship between the rates at which R and T go to infinity, thus allowing for the case of R
Working Paper
The Impact of COVID on Productivity and Potential Output
The U.S. economy came into the pandemic, and looks likely to leave it, on a slow-growth path. The near- term level of potential output has fallen because of shortfalls in labor that should reverse over time. Labor productivity, to a surprising degree, has followed an accelerated version of its Great Recession path with initially strong growth followed by weak growth. But, as of mid-2022, it appears that the overall level of labor and total factor productivity are only modestly affected. The sign of the effect depends on whether we use the strong income-side measures of pandemic output growth ...
Working Paper
The Impact of COVID on Potential Output
The level of potential output is likely to be subdued post-COVID relative to its previous estimates. Most clearly, capital input and full-employment labor will both be lower than they previously were. Quantitatively, however, these effects appear relatively modest. In the long run, labor scarring could lead to lower levels of employment, but the slow pre-recession pace of GDP growth is unlikely to be substantially affected.
Working Paper
Missing Growth from Creative Destruction
Statistical agencies typically impute inflation for disappearing products from the inflation rate for surviving products. As some products disappear precisely because they are displaced by better products, inflation may be lower at these points than for surviving products. As a result, creative destruction may result in overstated inflation and understated growth. We use a simple model to relate this ?missing growth? to the frequency and size of various kinds of innovations. Using U.S. Census data, we then apply two ways of assessing the magnitude of missing growth for all private nonfarm ...
Journal Article
Productivity During and Since the Pandemic
U.S. labor productivity initially surged in 2020 during the COVID-19 pandemic, despite the massive economic upheaval. As the economy recovered, the level of productivity retreated to its slow pre-pandemic trend. As of mid-2024, it remained close to but just above that trend. The surge and retreat in productivity follows the pre-pandemic cyclical relationship in which U.S. productivity rises temporarily in recessions. This example highlights the need to look through temporary cyclical effects when trying to infer longer-run trends.
Working Paper
Innovative Growth Accounting
Recent work highlights a falling entry rate of new firms and a rising market share of large firms in the United States. To understand how these changing firm demographics have affected growth, we decompose producÂtivity growth into the firms doing the innovating. We trace how much each firm innovates by the rate at which it opens and closes plants, the market share of those plants, and how fast its surviving plants grow. Using data on all nonfarm businesses from 1982-2013, we find that new and young firms (ages Oto 5 years) account for almost one-half of growth- three times their share of ...
Journal Article
Is Rising Concentration Hampering Productivity Growth?
U.S. productivity is growing slower than in the past. Meanwhile, sales have become increasingly concentrated in the largest businesses. Analysis suggests that IT innovation may have facilitated the rise in concentration by reducing the cost for large firms to enter new markets. This contributed to booming productivity growth from 1995 to 2005. Though large firms are more profitable, their expansion may have increased competition and reduced profit margins within markets. Lower profit margins in a given market could have deterred innovation, eventually lowering growth.
Journal Article
Is Slow Still the New Normal for GDP Growth?
Estimates suggest the new normal pace for U.S. GDP growth remains between 1% and 1%, noticeably slower than the typical pace since World War II. The slowdown stems mainly from demographic trends that have slowed labor force growth, about which there is relatively little uncertainty. A larger challenge is productivity. Achieving GDP growth consistently above 1% will require much faster productivity growth than the United States has typically experienced since the 1970s.
Working Paper
Productivity in the World Economy During and After the Pandemic
This paper reviews how productivity has evolved around the world since the pandemic began in 2020. Productivity in many countries has been volatile. We conclude that the broad contours of productivity growth during this period have been heavily shaped by predictable cyclical patterns. Looking at U.S. industry data, we find little evidence that the sharp rise in telework has had a notable impact, good or bad, on productivity. Stepping back, the data so far appear consistent with a continuation of the slow-productivity-growth trajectory that we faced before the pandemic.
Journal Article
Labor Productivity in a Pandemic
U.S. labor productivity has grown quickly during the pandemic compared with the past decade. However, this rapid pace is unlikely to be sustained. Similar to the Great Recession, the primary reasons for strong productivity growth now are cyclical effects that are likely to unwind as the economy continues to recover. For example, the number of workers has fallen, so capital per worker has risen—raising labor productivity in the short term. What effect the pandemic itself might have on productivity remains uncertain.