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Author:Wen, Yi 

Working Paper
Capital, finance, and trade collapse

This paper proposes a model of international trade with capital accumulation and financial intermediation. This is achieved by embedding the Melitz (2003) model into an incomplete-markets neoclassical framework with an endogenous credit market. The model preserves the analytical tractability of the original Melitz model despite non-trivial distribution of firms? net worth and capital stocks. We use the model to examine the differential effects of financial and non-financial shocks on aggregate output and international trade flows. The model predicts that trade volume declines far more sharply ...
Working Papers , Paper 2012-003

Working Paper
By force of demand: explaining international comovements and the saving-investment correlation puzzle

This paper explores the possibility that economic fluctuations may be largely demand-driven. It is shown that the stylized open-economy business cycle regularities documented by Feldstein and Horioka (1980) and Backus, Kehoe and Kydland (1992) can be explained by demand shocks alone even in a standard general equilibrium model. Frictions such as market incompleteness, increasing returns to scale, and sticky prices do not appear to be the preconditions for resolving these long-standing puzzles.
Working Papers , Paper 2005-043

Working Paper
Incomplete information and self-fulfilling prophecies

This paper shows that incomplete information can be a rich source of sunspots equilibria. This is demonstrated in a standard dynamic general equilibrium model of monopolistic competition ? la Dixit-Stiglitz. In the absence of fundamental shocks, the model has a unique certainty (fundamental) equilibrium, but there are also multiple stochastic (sunspots) equilibria that are not mere randomizations over fundamental equilibria. In other words, sunspots can exist in infinite-horizon dynamic models with a unique saddle path steady state. In contrast to the recent sunspots literature (e.g., ...
Working Papers , Paper 2007-033

Working Paper
Macroeconomic Effects of Government Spending in China

Government spending plays an important role in determining economic performances in China. Its macroeconomic effects are analyzed in this paper. We show that government spending in China (i) Granger-causes output, consumption and investment booms as well as inflation and (ii) has a multiplier larger than 1. The large multiplier effects are found not only in aggregate time-series data but also in panel data at the provincial level. We also provide a theoretical model and Monte Carlo analysis to rationalize our empirical findings. Our theoretical and Monte Carlo analyses support the large ...
Working Papers , Paper 2013-013

Working Paper
Understanding the large negative impact of oil shocks

This paper offers a plausible explanation for the close link between oil prices and aggregate macroeconomic performance in the 1970s. Although this link has been well documented in the empirical literature, standard economic models are not able to replicate this link when actual oil prices are used to simulate the models. In particular, standard models cannot explain the depth of the recession in 1974-75 and the strong revival in 1976-78 based on the oil price movements in that period. This paper argues that a missing multiplier-accelerator mechanism from standard models may hold the key.
Working Papers , Paper 2005-042

Working Paper
Two-way capital flows and global imbalances: a neoclassical approach

Financial capital and fixed capital tend to flow in opposite directions between poor and rich countries. Why? What are the implications of such two-way capital flows for global trade imbalances and welfare in the long run? This paper introduces frictions into a standard two- country neoclassical growth model to explain the pattern of two-way capital flows between emerging economies (such as China) and the developed world (such as the United States). We show how underdeveloped credit markets in China can lead to abnormally high rate of returns to fixed capital but excessively low rate of ...
Working Papers , Paper 2012-016

Working Paper
Labor hoarding and inventories

Labor hoarding is a widely believed empirical behavior of firms and a prominent explanation for procyclical labor productivity. Conventional wisdom attributes labor hoarding to labor adjustment costs. This paper argues that the conventional wisdom is inadequate for understanding labor hoarding because it ignores the role of inventories. Since idle labor can be used to produce inventories, why do firms hoard labor when inventory is an option? Using a dynamic rational expectations model of profit-maximizing firms facing demand uncertainty, this paper studies the dynamic interactions between ...
Working Papers , Paper 2005-040

Working Paper
Uncertainty and sentiment-driven equilibria

We construct a model to capture the Keynesian idea that production and employment decisions are based on expectations of aggregate demand driven by sentiments and that realized demand follows from the production and employment decisions of firms. We cast the Keynesian idea into a simple model with imperfect information about aggregate demand and we characterize the rational expectations equilibria of this model. We find that the equilibrium is not unique despite the absence of any non-convexities or strategic complementarity in the model. In addition to multiple fundamental equilibria, there ...
Working Papers , Paper 2013-011

Working Paper
Optimal Monetary Policy under Negative Interest Rate

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
Flight to What? — Dissecting Liquidity Shortages in the Financial Crisis

We endogenize the liquidity and the quality of private assets in a tractable incomplete-market model with heterogeneous agents. The model decomposes the convenience yield of government bond into a "liquidity premium" (flight to liquidity) and a "safety premium" (flight to quality) over the business cycle. When calibrated to match the U.S. aggregate output fluctuations and bond premiums, the model reveals that a sharp reduction in the quality, instead of the liquidity, of private assets was the culprit of the recent financial crisis, consistent with the perception that it was the subprime ...
Working Papers , Paper 2017-25

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