Self-fulfilling prophecies in the quality ladders economy

If R&D difficulty increases as it accumulates, as recent evidence suggests, then there is a value in the diversification of the aggregate R&D efforts over the whole range of industries in the economy. However, this paper proves that the quality ladders models allow for self-fulfilling prophecies to divert R&D from an arbitrary number of sectors, with potentially dramatic effects on the dynamics of industry structure and on the long-run aggregate growth performance. Moreover, in developing countries, perfect markets might allow stagnant monopolies to resist despite the removal of fundamental entry barriers to dynamic competition. This kind of coordination failure implies potentially strong effects of socio-cultural factors on growth and suggests a positive role for public R&D policy even in a framework of semi-exogenous growth.     

International trade, exhaustible-resource abundance and economic growth

Countries with oil and other natural resources have grown less rapidly than those countries without. This phenomenon is known as the “natural resource curse”. We develop an infinite-horizon, two-country model of trade in which countries are identical, except that one country is endowed with deposits of an exhaustible resource and the other is not. Within the context of the model, we show that this phenomenon can be explained in part by an inelastic demand for the exhaustible resource that increases growth in trade revenues and induces the resource-abundant country to invest relatively less than the country lacking in exhaustible resources. These results are derived analytically and illustrated by an empirical analysis based on plausible parameters obtained from data.     

Education,Innovation and Long‐Run Growth

We extend a second‐generation Schumpeterian growth model to incorporate human capital accumulation to clarify the general equilibrium effects of subsidy policies on human capital accumulation and R&D activities in a unified framework. Despite the conventional argument that subsidies always stimulate these growth‐promoting activities, we find that subsidies asymmetrically affect human capital accumulation and R&D activities. Our theoretical results suggest that research using standard models of human capital might find false negative relationships between education subsidies and economic growth.     

FISCAL POLICY IN AN ENDOGENOUS GROWTH MODEL WITH PUBLIC CAPITAL AND POLLUTION

This paper studies the growth and welfare effects of fiscal policy in an endogenous growth model with public capital and environmental pollution. I assume that pollution is due to aggregate production, and that it does not have a direct effect on production but only reduces household utility. I study the growth effects of fiscal policy for the model on the balanced growth path, taking transition dynamics into account. I then analyse the welfare effects of fiscal policy along the balanced growth path. Finally, I show how the fiscal parameters must be set so that the competitive economy replicates the social optimum.     

Inequality,growth, and environmental quality trade‐offs in a model with human capital accumulation

This paper develops a simple endogenous growth model where pollution exposure and vulnerability are unequally spread across the population, and growth and distribution are endogenous. In this set‐up, we investigate whether trade‐offs between growth, distributional, and environmental concerns may emerge. We show that a tighter environmental policy reduces income inequality and can improve both growth and total welfare. Immediate welfare losses, though, do occur, and are larger for countries that start at low levels of environmental quality (e.g. developing countries).     

Characterizing the sustainability problem in an exhaustible resource model

We provide a general condition under which consumption can be sustained indefinitely bounded away from zero in the continuous time Dasgupta–Heal–Solow–Stiglitz model, by letting augmentable capital substitute for a non-renewable resource. The assumptions made on the production function are mild, thus generalizing previous work. By showing that Hartwick?s rule minimizes the required resource input per unit of capital accumulation, and integrating the required resource input with respect to capital, we obtain a complete technological characterization without reference to the time path. We also use the characterization result to establish general existence of a maximin path.     

Dynamic Analysis of an Endogenous Growth Model with Investment‐specific Technological Change

This paper examines a dynamically optimal subsidy policy in a continuous‐time version of the endogenous growth model developed by Krusell (Krusell, P. (1998) “Investment‐Specific R&D and the Decline in the Relative Price of Capital”, Journal of Economic Growth, vol. 3, no. 2, pp. 131–141), in which investment‐specific technological progress occurs endogenously because of R&D performed by monopolistic firms. It is demonstrated that a combination of the time‐invariant subsidy for investment and the time‐variant subsidy for R&D enables the market equilibrium to replicate the socially optimal allocation.     

Growth effects of environmental policy when pollution affects health

In this paper, we develop a R&D-based growth model with a pollution externality and a health production sector. We study how health-impairing pollution affects long term growth, and the effect of an emissions' reduction policy (tax). We show that a tighter environmental tax has positive effects on growth via two channels. On the one hand, it improves workers' health and, thereby, productivity; on the other hand, it induces a reallocation of resources towards R&D and, thereby, higher research intensity. The size of the growth effect of a tighter environmental tax, and the level of the optimal environmental tax, are both positively correlated with the weight individuals place on health relative to consumption. As for welfare, a tighter environmental tax brings about utility gains in the long run and, potentially, also in the short run.     

Why are crude oil prices high when global activity is weak?

There have been substantial increases in liquidity in recent years and real oil prices have almost returned to the high levels achieved before the global financial crisis. Unanticipated increases in global real M2 led to statistically significant increases in real oil prices. The historical impact of global real M2 on the real price of crude oil is important in the recovery of oil prices over 2009 to 2011.     

Endogenous skill heterogeneity and inflation

This paper examines the implications of ex ante skill heterogeneity for long run inflation. We develop a dynamic general equilibrium model in which there are two types of labor (skilled and unskilled), two types of capital (human and physical), and money is introduced via a cash in advance constraint on consumption purchases. Skill heterogeneity is characterized in terms of (i) a parameter governing the ease with which the two types of labor can be substituted for each other in production; and (ii) the “productivity” of human capital in the production of skill. The model includes the accumulation of human capital which in turn creates skill heterogeneity among workers through an efficiency wage mechanism. Numerical experiments indicate that there is a range of parameter estimates in which the Friedman Rule may not be optimal. Furthermore, our quantitative experiments also indicate that there is a range of parameter values in which a greater degree of skill heterogeneity may be associated with a greater preference for inflation. Empirically, we also find that the inflation and heterogeneity correlation is positive.     

GROWTH AND CYCLES, IN THE MODE OF MARX AND SCHUMPETER

I propose a theory of endogenous growth and cycles under competitive conditions. Firms choose how many workers to hire, how much to invest, and which technologies to use. New capacity, embodying labor-saving technologies, is costlier than old one but allows for a lower wage bill. The interaction between labor-saving innovations and changes in the relative price of labor is the source of growth cycles.     

Optimal exporting of exhaustible resources with endogenous trade revenue: The case of a resource-scarce and capital-short economy

This paper discusses a dynamic trade problem of a resource-scarce and capital-short open economy. In this economy, exhaustible resources are traded for foreign capital. Different from previous research on similar topics, the models in this paper allows for endogenous export revenue. The optimal trade behavior of the economy is discussed here. The efficiency conditions for the optimal trading under various assumptions are derived. These conditions correspond to the noted Hotelling rules in a closed economy. Finally, policy implications of the results are presented.     

Indeterminacy in dynamic models: When Diamond meets Ramsey

We consider an aggregate two-periods overlapping generations model with endogenous labor, consumption in both periods of life, homothetic preferences and productive external effects coming from the average capital and labor. We show that under realistic calibrations of the parameters, in particular a large enough share of first period consumption over the wage income, local indeterminacy of equilibria cannot occur with capital externalities alone. It can nevertheless occur when there are only, even very small, vanishing labor externalities provided that the elasticity of capital-labor substitution and the wage elasticity of the labor supply are large enough. We also show that if labor externalities are slightly stronger, but still small enough to be plausible, and the elasticity of labor supply is larger, local indeterminacy occurs in a Cobb-Douglas economy. Finally, we show that a locally indeterminate steady state is generically characterized by an under-accumulation of capital. It follows therefore that while agents live over a finite number of periods, the conditions for the existence of locally indeterminate equilibria are very similar to those obtained within infinite horizon models and that from this point of view, Diamond meets Ramsey.