The failure of Ricardian equivalence under dynastic altruism

This paper investigates the theoretical accuracy of the Barro [Barro, R.J., 1974. Are government bonds net wealth? Journal of Political Economy, 82, 1095–1117] debt neutrality proposition. We first identify a discrepancy between the transversality condition of a social planning problem and the one of altruistically linked overlapping generations. Then, this discrepancy is exploited to construct public debt policies which affect the competitive equilibrium allocation even when bequests are strictly positive in all periods: a violation of Ricardian equivalence.     

Nonlinearity and the Unit Root Hypothesis for African Per Capita Real GDP

Once described as an epic center of growth tragedy, African nations have lately achieved relatively rapid growth rates, which have raised hopes that the continent is finally on the path to economic convergence with other emerging economies. However, there is a need to establish whether stabilization policies for the purpose of enhancing the GDP are effective in African countries. One of the means of examining the effectiveness of these policies is through the investigation of the unit root properties of per capita GDP in the continent. This study aims to add to the existing papers on GDP in African countries by investigating the non-stationarity of per capita GDP in 52 African countries, while using a newly proposed nonlinear unit root test. The results suggest that per capita GDP follows the non-stationarity process in half of the entire sample.     

Interpretable Machine Learning Using Partial Linear Models*

Despite their high predictive performance, random forest and gradient boosting are often considered as black boxes which has raised concerns from practitioners and regulators. As an alternative, we suggest using partial linear models that are inherently interpretable. Specifically, we propose to combine parametric and non-parametric functions to accurately capture linearities and non-linearities prevailing between dependent and explanatory variables, and a variable selection procedure to control for overfitting issues. Estimation relies on a two-step procedure building upon the double residual method. We illustrate the predictive performance and interpretability of our approach on a regression problem.     

Social Security and Private Transfers in Developing Countries: The Case of Peru

Do social security systems "crowd out" private transfers fromyounger to older generations? This question has generated muchtheoretical discussion, but little empirical work exists toconfirm or refute this crowding-out hypothesis. We investigatethe connection between social security and private transfersin Peru, using the Peruvian Living Standards Survey, and findthat private transfers from young to old would have been nearly20 percent higher without social security benefits. This indicatesthat the Peruvian social security system is less effective atdelivering benefits to the elderly than a simple assignmentof government expenditures would suggest. Social security'sdisplacement of private transfers, while significant, is lessthan that predicted by models with widespread altruistic transfers.     

Theorizing Borders: An Interdisciplinary Perspective

The current renewed interest in the study of borders and borderlands is paralleled by a growing concern and debate on the possibility of a border model, or models, and of a border theory, or theories. Certainly, there is a new attention to theoretical consideration and discussion that could help sharpen our understanding of borders. In this essay, I argue that a model or general framework is helpful for understanding borders, and I suggest a theory of borders. The seeds of my arguments are grounded in a variety of discussions and in the works of border scholars from a variety of social science disciplines. My contention is that the literature on borders, boundaries, frontiers, and borderland regions suggests four equally important analytical lenses: (1) market forces and trade flows, (2) policy activities of multiple levels of governments on adjacent borders, (3) the particular political clout of borderland communities, and (4) the specific culture of borderland communities. A model of border studies is presented in the second part of this essay, and I argue that these lenses provide a way of developing a model that delineates a constellation of variables along four dimensions.     

The effect of remittances on the current account in developing and emerging economies

This paper presents an analysis of the effect of remittances on the current account in developing and emerging economies, incorporating an assessment of the extent to which exchange rate regimes impact the relationship. The main findings suggest that there is a positive effect of remittances on the current account contemporaneously, but that the lagged effect is negative, which could be indicative of the existence of some underlying mechanisms characteristic of the Dutch disease phenomenon. In addition, the results show that a more flexible exchange regime dampens the contemporaneous positive effect that remittances have on the current account. The paper, therefore, asserts that policymakers face trade‐offs pertaining to the use of exchange rate policy in managing the effects of remittances on the current account, which should be given due consideration when such policy choices are made.     

Wages and productivity growth in a competitive industry

We describe the evolution of productivity growth in a competitive industry with free entry and exit. The exogenous wage rate determines the firms’ engagement in labor productivity enhancing process innovation. There is a unique steady state of the industry dynamics, which is globally asymptotically stable. In the steady state, the number of active firms, their unit labor cost and supply depend on the growth rate but not on the level of the wage rate. In addition to providing comparative statics of the steady state, the paper characterizes the industry's adjustment path.     

Exchange Rate Flexibility and the Effect of Remittances on Economic Growth

This paper studies the question of whether exchange rate policy affects the impact of remittances on economic growth in recipient countries. The findings indicate that more flexible exchange rate regimes are associated with a greater increase in economic growth following an increase in remittances, but also that the impact of remittances on growth is positive under a fixed regime. The results further show that the effect of remittances under a fixed exchange rate regime is positive in less financially developed countries as well, but do not provide conclusive evidence that this effect varies inversely with exchange rate flexibility in such economies as theorized; the results being sensitive to the choice of financial development indicator.     

Research,Innovation And Productivi[Ty: An Econometric Analysis At The Firm Level

This paper studies the links between productivity, innovation and research at the firm level. We introduce three new features: (i) A structural model that explains productivity by innovation output, and innovation output by research investment: (ii) New data on French manufacturing firms, including the number of European patents and the percentage share of innovative sales, as well as firm-level demand pull and technology push indicators; (iii) Econometric methods which correct for selectivity and simultaneity biases and take into account the statistical features of the available data: only a small proportion of firms engage in research activities and/or apply for patents; productivity, innovation and research are endogenously determined; research investment and capital are truncated variables, patents are count data and innovative sales are interval data.

We find that using the more widespread methods, and the more usual data and model specification, may lead to sensibly different estimates. We find in particular that simultaneity tends to interact with selectivity, and that both sources of biases must be taken into account together. However our main results are consistent with many of the stylized facts of the empirical literature. The probability of engaging in research (R&D) for a firm increases with its size (number of employees), its market share and diversification, and with the demand pull and technology push indicators. The research effort (R&D capital intensity) of a firm engaged in research increases with the same variables, except for size (its research capital being strictly proportional to size). The firm innovation output, as measured by patent numbers or innovative sales, rises with its research effort and with the demand pull and technology indicators, either directly or indirectly through their effects on research. Finally, firm productivity correlates positively with a higher innovation output, even when controlling for the skill composition of labor as well as for physical capital intensity.