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Author:Hur, Sewon 

Journal Article
The Winners and Losers from Trade
Although increased international trade is widely viewed as beneficial to the economies of the participating countries, the benefits are not distributed evenly across individuals within those countries, and indeed some individuals may bear a cost. We discuss two channels through which trade can affect individuals differently depending on their skill and income levels and assess the combined impact of those channels. We find that the effects of trade on the labor market and the effects of trade on prices go in opposite directions and are of similar magnitude.
AUTHORS: Carroll, Daniel R.; Hur, Sewon
DATE: 2019-09

Working Paper
On the Heterogeneous Welfare Gains and Losses from Trade
How are the gains and losses from trade distributed across individuals within a country? First, we document that tradable goods and services constitute a larger fraction of expenditures for low-wealth and low-income households. Second, we build a trade model with nonhomothetic preferences?to generate the documented relationship between tradable expenditure shares, income, and wealth?and uninsurable earnings risk?to generate heterogeneity in income and wealth. Third, we use the calibrated model to quantify the differential welfare gains and losses from trade along the income and wealth distribution. In a numerical exercise, we permanently reduce trade costs so as to generate a rise in import share of GDP commensurate with that seen in the data from 2001 to 2014. We find that households in the lowest wealth decile experience welfare gains over the transition, measured by permanent consumption equivalents, that are 57 percent larger than those in the highest wealth decile.
AUTHORS: Carroll, Daniel R.; Hur, Sewon
DATE: 2019-09-23

Working Paper
On the Heterogeneous Welfare Gains and Losses from Trade
How are the gains and losses from trade distributed across individuals within a country? First, we document that tradable goods and services constitute a larger fraction of expenditures for low-wealth and low-income households. Second, we build a trade model with nonhomothetic preferences?to generate the documented relationship between tradable expenditure shares, income, and wealth?and uninsurable earnings risk?to generate heterogeneity in income and wealth. Third, we use the calibrated model to quantify the differential welfare gains and losses from trade along the income and wealth distribution. In a numerical exercise, we permanently reduce trade costs so as to generate a rise in import share of GDP commensurate with that seen in the data from 2001 to 2014. We find that households in the lowest wealth decile experience welfare gains over the transition, measured by permanent consumption equivalents, that are 67 percent larger than those in the highest wealth decile.
AUTHORS: Hur, Sewon; Carroll, Daniel R.
DATE: 2019-07-19

Working Paper
On the Heterogeneous Welfare Gains and Losses from Trade
How are the gains and losses from trade distributed across individuals within a country? First, we document that tradable goods constitute a larger fraction of expenditures for poor households. Second, we build a trade model with nonhomothetic preferences?to generate the documented relationship between tradable expenditure shares, income, and wealth?and uninsurable earnings risk?to generate heterogeneity in income and wealth. Third, we use the calibrated model to quantify the differential welfare gains and losses from trade along the income and wealth distribution. In a numerical exercise, we permanently reduce trade costs so as to generate a rise in import share of GDP commensurate with that seen in the data from 2001 to 2014. We find that households in the lowest wealth decile experience welfare gains over the transition, measured by permanent consumption equivalents, that are 67 percent larger than those in the highest wealth decile.
AUTHORS: Carroll, Daniel R.; Hur, Sewon
DATE: 2019-03-22

Working Paper
Firm Entry and Exit and Aggregate Growth
Applying the Foster, Haltiwanger, and Krizan (FHK) (2001) decomposition to plant-level manufacturing data from Chile and Korea, we find that the entry and exit of plants account for a larger fraction of aggregate productivity growth during periods of fast GDP growth. Studies of other countries confirm this empirical relationship. To analyze this relationship, we develop a simple model of firm entry and exit based on Hopenhayn (1992) in which there are analytical expressions for the FHK decomposition. When we introduce reforms that reduce entry costs or reduce barriers to technology adoption into a calibrated model, we find that the entry and exit terms in the FHK decomposition become more important as GDP grows rapidly, just as they do in the data from Chile and Korea.
AUTHORS: Asturias, Jose; Ruhl, Kim J.; Kehoe, Timothy J.; Hur, Sewon
DATE: 2019-02-01

Working Paper
A theory of rollover risk, sudden stops, and foreign reserves
Emerging economies, unlike advanced economies, have accumulated large foreign reserve holdings. We argue that this policy is an optimal response to an increase in foreign debt rollover risk. In our model, reserves play a key role in reducing debt rollover crises ("sudden stops"), akin to the role of bank reserves in preventing bank runs. We find that a small, unexpected, and permanent increase in rollover risk accounts for the outburst of sudden stops in the late 1990s, the subsequent increase in foreign reserves holdings, and the salient resilience of emerging economies to sudden stops ever since. Finally, we show that a policy of pooling reserves can substantially reduce the reserves needed by emerging economies.
AUTHORS: Kondo, Illenin O.; Hur, Sewon
DATE: 2013

Working Paper
Inflation, Debt, and Default
We study how the co-movement of inflation and economic activity affects real interest rates and the likelihood of debt crises. First, we show that for advanced economies, periods with procyclical inflation are associated with lower real interest rates. Procyclical inflation implies that nominal bonds pay out more in bad times, making them a good hedge against aggregate risk. However, such procyclicality also increases sovereign default risk when the economy deteriorates, since the government needs to make larger (real) payments. In order to evaluate both effects, we develop a model of sovereign default on domestic nominal debt with exogenous inflation risk and domestic risk-averse lenders. Countercyclical inflation is a substitute with default, while procyclical inflation is a complement with it, by increasing default incentives. In good times, when default is unlikely, procyclical inflation yields lower real rates. In bad times, as default becomes more material, procyclical inflation can magnify default risk and trigger an increase in real rates.
AUTHORS: Hur, Sewon; Perri, Fabrizio; Kondo, Illenin O.
DATE: 2018-09-28

Report
Real Interest Rates, Inflation, and Default
This paper argues that the comovement between inflation and economic activity is an important determinant of real interest rates over time and across countries. First, we show that for advanced economies, periods with more procyclical inflation are associated with lower real rates, but only when there is no risk of default on government debt. Second, we present a model of nominal sovereign debt with domestic risk-averse lenders. With procyclical inflation, nominal bonds pay out more in bad times, making them a good hedge against aggregate risk. In the absence of default risk, procyclical inflation yields lower real rates. However, procyclicality implies that the government needs to make larger (real) payments when the economy deteriorates, which could increase default risk and trigger an increase in real rates. The patterns of real rates predicted by the model are quantitatively consistent with those documented in the data.
AUTHORS: Perri, Fabrizio; Hur, Sewon; Kondo, Illenin O.
DATE: 2018-12-12

Report
Firm Entry and Exit and Aggregate Growth
Using data from Chile and Korea, we find that a larger fraction of aggregate productivity growth is due to firm entry and exit during fast-growth episodes compared to slow-growth episodes. Studies of other countries confirm this empirical relationship. We develop a model of endogenous firm entry and exit based on Hopenhayn (1992). Firms enter with efficiencies drawn from a distribution whose mean grows over time. After entering, a firm?s efficiency grows with age. In the calibrated model, reducing entry costs or barriers to technology adoption generates the pattern we document in the data. Firm turnover is crucial for rapid productivity growth.
AUTHORS: Ruhl, Kim J.; Kehoe, Timothy J.; Hur, Sewon; Asturias, Jose
DATE: 2017-02-21

Report
The Interaction and Sequencing of Policy Reforms
In what order should a developing country adopt policy reforms? Do some policies complement each other? Do others substitute for each other? To address these questions, we develop a two-country dynamic general equilibrium model with entry and exit of firms that are monopolistic competitors. Distortions in the model include barriers to entry of firms, barriers to international trade, and barriers to contract enforcement. We find that a reform that reduces one of these distortions has different effects depending on the other distortions present. In particular, reforms to trade barriers and barriers to the entry of new firms are substitutable, as are reforms to contract enforcement and trade barriers. In contrast, reforms to contract enforcement and the barriers to entry are complementary. Finally, the optimal sequencing of reforms requires reforming trade barriers before contract enforcement.
AUTHORS: Asturias, Jose; Hur, Sewon; Kehoe, Timothy J.; Ruhl, Kim J.
DATE: 2015-11-23

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