International capital flows,debt overhang and volatility

This paper shows how international capital flows originate boom‐bust and sunspot episodes in a neoclassical growth model of a small, open economy. A limit is imposed on how much the economy can borrow from foreign creditors and it is made endogenous by assuming that the debt‐to‐GDP ratio is procyclical. The steady state is locally indeterminate when the credit multiplier is larger than some threshold level, whereas saddle‐point stability prevails when the credit multiplier is low enough. As a consequence, high levels of the credit multiplier lead to both booms followed by busts and sunspot‐driven volatility near the steady state, while, in contrast, low levels ensure monotonic convergence. Compared with saddle‐path equilibria, boom‐bust and sunspot equilibria are associated with both lower welfare and debt overhang, that is, a crowding‐out effect of credit: when the economy is highly leveraged, it uses savings to cut down foreign debt, at the expense of both human and physical investment. Numerical examples show that indeterminacy arises for debt‐to‐GDP ratios that fall within the range of available estimates. Finally, the effects of shocks to the world interest rate on output and consumption are amplified and persistent in the debt overhang regime.     

世代交叠模型中的环境政策分析

本文在OLG模型中考虑资本生产带来的环境外部性，分析了市场竞争均衡结构下的资本动态学，并且在稳态时比较静态分析经济中各因素对经济和环境的影响，认为：严厉的环境政策有利于积累更多的资本，且有利于提高环境质量等。另外，政府在征收环境税，内在化环境外部性的同时，还需要征收消费税、一次性转移等内在化代际外部性以实现社会最优配置。     

Endogenous transportation technology in a Cournot differential game with intraindustry trade

We investigate a dynamic Cournot duopoly with intraindustry trade, where firms invest in R&D to reduce the level of iceberg transportation costs. We adopt both open-loop and closed-loop equilibrium concepts, showing that a unique (saddle point) steady state exists in both cases. In the open-loop model, optimal investments and the resulting efficiency of transportation technology are independent of the relative size of the two countries. On the contrary, in the closed-loop case firms’ R&D incentives are driven by the relative size of the two countries. Policy implications are also evaluated.     

Time preference and two-country trade

We present a dynamic two-country model of international trade with endogenous time preference. We show that if the two countries have similar preferences, production technologies and labor endowments, there exists a unique and stable steady state such that both consumption and investment goods are produced in both countries. Unlike the case of constant time preferences, the steady state is independent of the initial international distribution of capital. We prove a dynamic Heckscher–Ohlin theorem such that the labor-abundant country exports the labor-intensive good.     

Entry and the accumulation of capital: A two state variable extension to the Ramsey model

In this paper we consider the entry and exit of firms in a dynamic general equilibrium model with capital. At the firm level, there is a fixed cost combined with increasing marginal cost, which gives a standard U‐shaped cost curve with optimal firm size. Entry is determined by a free entry condition such that the cost of entry is equal to the present value of incumbent firms. The cost of entry (exit) depends on the flow of entry (exit). Equilibrium is saddle‐point stable and the stable manifold is two‐dimensional. Transitional dynamics can, under certain circumstances, be non‐monotonic.     

Endogenous business cycles and dynamic inefficiency

This paper explores how the occurrence of local indeterminacy and endogenous business cycles relates to dynamic inefficiency, as defined by Malinvaud (1953), Phelps (1965) and Cass (1972). We follow Reichlin (1986) and Grandmont (1993) by considering a two-period overlapping generations model of capital accumulation with labor–leisure choice into the first-period of an agent's life and consumption in both periods. We first show that local indeterminacy and Hopf bifurcation are necessarily associated with a capital–labor ratio that is, at steady state, larger than the Golden Rule level. Consequently, paths converging asymptotically towards the steady state are shown to be dynamically inefficient, as there always exists another trajectory that starts with the same initial conditions and produces more aggregate consumption at all future dates. More surprising, however, is our main result showing that stable orbits, generated around a dynamically inefficient steady state through a supercritical Hopf bifurcation, may, in contrast, be dynamically efficient.     

Nosy Preferences,Benevolence, and Efficiency

We explore the implications of “nosy” preferences—when individuals have rankings over the specific actions of others—using recent theoretical results in the behavioral economics literature. Our model jointly captures preference interdependence over utilities (benevolence) and actions (nosiness). We apply the model to two well‐known environments. The first is a classic social choice problem; the second is a model of relative consumption concerns. For the former we characterize the existence of the impossibility once the social choice problem has been modeled as a behavioral game. For the latter we characterize when the negative externality arising from relative consumption concerns can be overcome without a policy intervention.     

Equilibrium Selection in an Experimental Macroeconomy

In this paper we report the results of an experiment designed to study the behavior of a laboratory macroeconomy with two stable steady states. The economy has the structure of an optimal growth model in which resources are allocated between consumption and investment over a sequence of time periods. The economy is decentralized, with a market for capital in operation. We find that the economy often falls into the Pareto-inferior steady state, which can be viewed as a poverty trap. The initial endowment of capital stock is varied as a treatment variable in the experiment, and the economy is more likely to reach the optimal steady state when its initial endowment is high than when it is low. Organizing the economy with a central planner directing economic activity fails to induce it to reach the optimal steady state.     

Golden Rules of Wages

We consider a neoclassical growth model where labor collectively chooses labor share to maximize its steady‐state wage rate. In the basic two‐factor model, labor maximizes the steady‐state wage rate by setting labor share equal to the elasticity of output with respect to labor. This is precisely the competitive outcome. Only when we consider the model with organized and unorganized labor types can organized labor raise its steady‐state wage by choosing a higher than competitive labor share. Organized labor can benefit by choosing a higher labor share only at the expense of unorganized workers; not capital. We also analyze a version of the model that incorporates a tradeoff between collective bargaining opportunities and skill acquisition. All else equal, a higher skill premium leads organized labor to choose a higher labor share. Organized labor benefits again at the expense of skilled workers; not capital.     

Externalities,Cross-Sectoral Spillovers and Productivity Growth

We provide an interpretation of the productivity dynamics in the manufacturing sector based on the idea of the thick market externality à la Diamond. An econometric model has been estimated which allows to disentangle the long run effects of these trading externalities from those of internal economies of scale and of aggregate industry-level economies. The results obtained—based on a cointegrated system of non-linear-error-correction equations—confirm the hypothesis that the trading externality matters. Moreover, our findings point out that the emphasis generally posited both on internal and external economies of scale is not justified.     

The Effects of Inflation in a Small Open Economy with Durability in Consumption

This paper explores the dynamic effects of inflation in a small open economy when consumption exhibits certain degree of durability. With labor/leisure choice, and money introduced through a cash-in-advance (CIA) constraint on consumption expenditure, it is demonstrated that higher inflation reduces the steady state level of employment, investment, output and consumption. The country runs a current account surplus, despite the fall in output. Consistent with empirical evidence, durable consumption exhibits initial excess volatility. Numerical calibration shows that the steady state real effects of inflation are very significant in this model.     

经济转型期中国能源需求的长期均衡及短期波动:1978-2005

本文利用1978-2005年样本通过状态空间模型研究了改革开放以来能源需求、经济增长、效率改进等之间的动态相关性,在此基础上使用向量自回归模型、脉冲响应函数、方差分解模型等对能源需求及其影响因素之间的作用机理进行了系统分析,研究结论表明:改革开放以来能源需求、经济增长、产业结构调整、效率改进等存在长期稳定的均衡关系,能源需求的短期波动除了受到相关因素的直接影响外,制度变迁等不可观测变量对能源消费的模式及其变动有着巨大的推动作用;在对我国能源需求影响的众多变量中,我国经济增长方式的转变和工业化进程的深入推进,尤其是重工业比例在国民经济结构的进一步提高对能源需求的调整具有重要的决定作用;能源价格对能源需求的波动尚未起到明显的调控作用,我国政府应当进一步完善能源价格形成机制,使之能够在能源行业资源配置中起到基础作用.     

An empirical study on the hysteresis of currency substitution in Cambodia

This paper examines whether the currency substitution (CS) phenomenon in Cambodia is in a hysteresis state. We employ a simple model of money-in-the-utility function with two currencies (home and foreign), in which the effect of network externalities on the use of foreign currency is taken into account. The equation derived from the model is estimated using the autoregressive distributed lag approach to cointegration for the period from June 1993 to June 2009. Our estimation results indicate that (1) there exists a stable, long-run relationship among the variables considered, (2) the CS ratio increases when people expect a higher rate of depreciation in the exchange rate, and most importantly, (3) there is evidence supporting the existence of a network externality, thereby implying the hysteresis of the CS phenomenon in Cambodia. Given the characteristics of the CS process in Cambodia, any measure or policy option to bring down the CS degree must be carefully considered.     

CSR in an Asymmetric Duopoly with Environmental Externality

We investigate a linear state differential game describing an asymmetric Cournot duopoly with capacity accumulation á la Ramsey and a negative environmental externality (pollution), in which one of the firms has adopted corporate social responsibility (CSR) in its statute, and therefore includes consumer surplus and the environmental effects of production in its objective function. If the market is sufficiently large, the CSR firm sells more, accumulates more capital, and earns higher profits than its profit‐seeking rival.     

Multiple equilibria in a cash-in-advance two-sector economy

We consider a two-sector infinite horizon economy with a fractional cash-in-advance constraint on consumption expenditures. This formulation allows us to consider a steady-state velocity of money that is strictly greater than one and, therefore, provides a more plausible framework than the standard formulation in which all the consumption purchases are paid cash. We prove that the steady state is bound to be indeterminate and multiple equilibria occur when the share of the liquidity constraint is low enough and that a capital-intensive investment good or a strongly capital-intensive consumption good improve considerably the scope for indeterminacy. As a consequence, we show that without any restriction on the elasticity of intertemporal substitution in consumption, multiple equilibria might occur if the velocity of money is greater than a critical bound that is compatible with empirical estimates.     

Endogenous production of R&D and stable economic development

Summary Changes in production technology are usually a result of R&D efforts. In this paper a model is presented in which technological change emanates from production factors used for R&D. The model consists of two production sectors, one concerned with the production of consumption and investment goods, the other with that of new technologies. By means of this model we analyse the impact of R&D on the level of immediate income and the efficient allocation of production factors over both sectors. Furthermore, the existence of a steady state in this model is examined. It turns out that such a state is only possible under restrictive conditions.     

Education and growth: A simple model with complicated dynamics

We construct a simple model of education and growth in which children spend a fraction of their time and parents spend a fraction of their income on education. Both a strategic complementarity and an intergenerational externality are present. The interactions between each pair of consecutive generations lead to rich dynamics. We show that multiple growth equilibria arise, some of them periodic and some aperiodic. We also find a negative correlation between volatility and growth, without a one‐way causal relationship between the two being, necessarily, present. Rather, this negative correlation is driven by the structural characteristics of the economy.     

Misallocation in Chinese Manufacturing and Services: A Variable Markup Approach

Cross‐country comparison reveals an unusually small service sector in China. Using firm‐level data from China's 2008 economic census, we find two facts that speak to a novel mechanism of misallocation within service and between manufacturing and service sectors. First, compared with the manufacturing sector, there are more state‐owned enterprises and fewer entrants in the service sector. Second, markups increase with firm size, and the increase is more dramatic among service firms. We interpret these facts through the lens of a monopolistic competition model with heterogeneous firms and variable markups. A multisector model shows a new channel that translates asymmetric barriers to entry across sectors into sectoral markup differences, which in turn cause sectoral misallocation. Quantitative analysis shows that when reducing entry barriers to service firms to the extent observed for manufacturing firms, the model predicts a 12‐percentage‐point increase in the service employment share.     

Transformations of the state variable and learning dynamics

This article examines dynamics in a model where agents forecast a one dimensional state variable through ordinary least squares regressions on the lagged values of the state variable. We study the stability properties of alternative transformations of the state variable, such as taking logarithms, which the agent can endogenously set forth. Surprisingly, for the considered class of economies, we found that the transformations that an econometrician would attempt are destabilizing, whereas alternative transformations, which an econometrician would never consider, such as convex transformations, are stabilizing. Therefore, we ironically find that in our set‐up, an active agent who is concerned about learning the economy’s dynamics and who in an attempt to improve forecasting transforms the state variable using standard transformations, is more likely to deviate from the steady state than a passive agent.     

Consumption externalities,market imperfections and optimal taxation

In a dynamic model with a keeping‐up‐with‐the Joneses preference and market imperfections, we attempt to investigate under what circumstances and for what reason the optimal tax should be state‐varying. We extend the Ljungqvist and Uhlig (2000) proposition to include preferences that exhibit non‐homotheticity. We show that a keeping‐up‐with‐the‐Joneses preference (a non‐intertemporally‐dependent preference) can lead the social planner to commit to a state‐contingent tax on labor income. Moreover, the optimal labor income tax can be either procyclical or countercyclical with respect to economic fluctuations, this crucially depending on whether the level of contemporaneous consumption increases or decreases the wedge between the intertemporal substitution elasticity of households and of the social planner.