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Working Paper
How Times Have Changed: The Impact of the 2026 Iran War on the U.S. Economy
Kilian, Lutz; Plante, Michael D.; Richter, Alexander W. (2026-06-23)
The 2026 Iran war has raised the question of how exposed the U.S. economy is to geopolitical oil supply disruptions. It is widely believed that the U.S. economy has become less vulnerable to such disruptions as it has reduced its dependence on oil and changed from a major net oil importer to a net oil exporter. We develop a two-country model of the global economy with large geopolitical oil supply disruptions that distinguishes between the U.S. economy and the rest of the world. We find that the response of U.S. real GDP growth to the disruption in global oil supplies today is only ...
Working Papers , Paper 2615

Working Paper
Macrofinancial History and the New Business Cycle Facts
Taylor, Alan M.; Jordà, Òscar; Schularick, Moritz (2016-10-12)
In advanced economies, a century-long near-stable ratio of credit to GDP gave way to rapid financialization and surging leverage in the last forty years. This ?financial hockey stick? coincides with shifts in foundational macroeconomic relationships beyond the widely-noted return of macroeconomic fragility and crisis risk. Leverage is correlated with central business cycle moments, which we can document thanks to a decade-long international and historical data collection effort. More financialized economies exhibit somewhat less real volatility, but also lower growth, more tail risk, as well ...
Working Paper Series , Paper 2016-23

Working Paper
A Static Capital Buffer is Hard To Beat
Diba, Behzad T.; Canzoneri, Matthew B.; Mishin, Arsenii; Guerrieri, Luca (2026-06-22)
In a model with endogenous risk-taking, deposit insurance and limited liability may lead banks to make risky loans that are socially inefficient. Capital requirements can prevent excessive risk-taking at the cost of reducing liquidity-producing bank deposits. A policy that sets capital requirements just high enough to prevent excessive risktaking will move capital requirements pro-, counter-, or a-cyclically depending on the shock source. However, such a policy requires full knowledge of all the shocks hitting the economy and is not implementable. Simple rules that respond to cyclical ...
Finance and Economics Discussion Series , Paper 2026-042

Working Paper
Optimal Monetary Policy under Negative Interest Rate
Wen, Yi; Dong, Feng (2017-05-16)
In responding to the extremely weak global economy after the financial crisis in 2008, many industrial nations have been considering or have already implemented negative nominal interest rate policy. This situation raises two important questions for monetary theories: (i) Given the widely held doctrine of the zero lower bound on nominal interest rate, how is a negative interest rate (NIR) policy possible? (ii) Will NIR be effective in stimulating aggregate demand? (iii) Are there any new theoretical issues emerging under NIR policies? This article builds a model to show that (i) money ...
Working Papers , Paper 2017-19

Working Paper
Synergizing Ventures
Greenwood, Jeremy; Dinlersoz, Emin M.; Akcigit, Ufuk; Penciakova, Veronika (2019-09-01)
Venture capital (VC) and growth are examined both empirically and theoretically. Empirically, VC-backed startups have higher early growth rates and initial patent quality than non-VC-backed ones. VC backing increases a startup's likelihood of reaching the right tails of the firm size and innovation distributions. Furthermore, outcomes are better for startups matched with more experienced venture capitalists. An endogenous growth model, where venture capitalists provide both expertise and financing for business startups, is constructed to match these facts. The presence of venture capital, the ...
FRB Atlanta Working Paper , Paper 2019-17

Journal Article
An Elementary Model of VC Financing and Growth
Han, Pengfei; Greenwood, Jeremy; Sanchez, Juan M.; Inokuma, Hiroshi (2023-01-20)
This article uses an endogenous growth model to study how the improvements in financing for innovative start-ups brought by venture capital (VC) affect firm innovation and growth. Partial equilibrium results show how lending contracts change as financing efficiency improves, while general equilibrium results show that better screening and development of projects by VC investors leads to higher aggregate productivity growth.
Review , Volume 105 , Issue 1 , Pages 66-73

Working Paper
The Ramsey Steady-State Conundrum in Heterogeneous-Agent Economies
Wen, Yi; Chien, YiLi (2022-09-15)
In infinite horizon, heterogeneous-agent and incomplete-market models, the existence of an interior Ramsey steady state is often assumed instead of proven. This paper makes two fundamental contributions: (i) We prove that the interior Ramsey steady state assumed by Aiyagari (1995) does not exist in the standard Aiyagari model. Specifically, a steady state featuring the modified golden rule and a positive capital tax is feasible but not optimal. (ii) We design a modified, analytically tractable version of the standard Aiyagari model to unveil the necessary and/or sufficient conditions for the ...
Working Papers , Paper 2022-009

Report
Consumption heterogeneity, employment dynamics, and macroeconomic co-movement
Eusepi, Stefano; Preston, Bruce (2009)
Real-business-cycle models necessarily rely on total factor productivity shocks to explain the observed co-movement between consumption, investment, and hours. However, an emerging body of evidence identifies "investment shocks" as important drivers of business cycles. This paper shows that a neoclassical model consistent with observed heterogeneity in labor supply and consumption across employed and nonemployed can generate co-movement in response to fluctuations in the marginal efficiency of investment. Estimation reveals that these shocks explain the bulk of business-cycle variance in ...
Staff Reports , Paper 399

Working Paper
Are Government Bonds Net Wealth or a Liability? ---Optimal Debt and Taxes in an OLG Model with Uninsurable Income Risk
Wu, HsinJung; Wen, Yi; Chien, YiLi (2020-04-08)
The rapidly growing national debt in the U.S. since the 1970s has alarmed and intrigued the academic world. Consequently, the concept of dynamic (in)efficiency in an overlapping generations (OLG) world and the importance of the heterogeneous-agents and incomplete markets (HAIM) hypothesis to justify a high debt-to-GDP ratio have been extensively studied. Two important consensus emerge from this literature: (i) The optimal quantity of public debt is positive—due to insufficient private liquidity to support private saving and investment (see, e.g., Barro (1974), Woodford (1990), and Aiyagari ...
Working Papers , Paper 2020-007

Working Paper
Can Intangible Capital Explain Cyclical Movements in the Labor Wedge?
Gourio, Francois; Rudanko, Leena (2014-01-15)
Intangible capital is an important factor of production in modern economies that is generally neglected in business cycle analyses. We demonstrate that intangible capital can have a substantial impact on business cycle dynamics, especially if the intangible is complementary with production capacity. We focus on customer capital: the capital embodied in the relationships a firm has with its customers. Introducing customer capital into a standard real business cycle model generates a volatile and countercyclical labor wedge, due to a mismeasured marginal product of labor. We also provide new ...
Working Paper Series , Paper WP-2014-2

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