Working papers

Abstract This paper assesses whether and how setting up a sovereign wealth fund has a buffer effect against currency crises. Using an innovative dynamic logit panel model framework and a unique dataset covering 34 emerging countries over the period 1989–2019, we empirically show that sovereign wealth funds reduce the occurrence of currency crises. This result is robust to different econometric specifications, alternative definitions of sovereign wealth funds, controlling for currency crisis risk factors, and income level sampling. Our findings have important implications for financial stability and for policymakers, who could further exploit the potential of sovereign wealth funds to better manage foreign exchange risks.
Keywords Currency Crisis, Sovereign Wealth Funds, Financial stability
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Abstract We use an overlapping generations model with physical and human capital, and two reproductive periods to explore how fertility decisions may differ in response to economic incentives in early and late adulthood. In particular, we analyze the interplay between fertility choices—related to career opportunities—and wages, and investigate the role played by work experience and investment in both types of capital. We show that young adults postpone parenthood above a certain wage threshold and that late fertility increases with work experience. The long run trend is either to converge to a low productivity equilibrium, involving high early fertility, investment in physical capital and relatively low income, or to a high productivity equilibrium, where households postpone parenthood to invest in their human capital and work experience, with higher late fertility and higher levels of income. A convergence to the latter state would explain the postponement of parenthood and the mitigation or slight reversal of fertility decrease in some European countries in recent decades.
Keywords Fertility, Overlapping generations, Work experience, Postponement
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Abstract We analyze the impact of the COVID-19 outbreak on classroom peer relationships using a unique field dataset collected from 3rd and 4th-grade students in Turkey. Using data from both pre-pandemic and pandemic cohorts, we find significant changes in social interactions among the pandemic cohort after prolonged school closures. We observe varying effects contingent upon the nature of peer relationships. While friendship relationships deteriorated, some facets of academic support relationships among classmates display enhancement. However, this progress is exclusively observed among native students, as opposed to refugees. Additionally, we uncover significant improvements in inter-ethnicity and inter-gender relationships in classrooms after COVID-19.
Keywords Peer relationships, COVID-19, Classroom social networks, Refugees
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Abstract Data on EU economies show no correlation between low-skilled immigration and the skill premium. We rationalise this evidence in a model where firms face search and screening costs. Low-skilled immigration diminishes the relative benefit of screening skilled workers, leading to a decline in their relative ability within the firm and an undetermined impact on the skill premium. On region-sector and firm level data from 2008 to 2013, we find that low-skilled immigration in Italian regions has reduced skill intensity without affecting the skill premium. Using proxies for workers’ ability and screening activity, we provide supporting evidence for the theorised mechanisms.
Keywords MATCHING, Screening, Skill-intensity, Factor relative ability
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Abstract In this paper, we bring fresh evidence on the city size distribution from a ‘lab’ represented by the region of Bukhara observed in the 9th CE. At that time this region was homogeneous in all respects (technology, amenities, climate, culture, language, religion, etc.) and yet cities had different sizes. We rationalize the city size distribution of this economy in a simple general equilibrium spatial model of which we estimate the parameters using the method of moments. The estimated model predicts very well the 9th century city size distribution. Spatial centrality is the major determinant of city size. The silk road contributes to explain what centrality cannot. We find little evidence of persistence of the urban structure when comparing the 9th and the 21st century. We find instead that centroid of the region has moved towards the economic core of the Uzbek economy.
Keywords Centrality, Archaeological Data, Spatial Model
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Abstract Across countries, women and men allocate time differently between market work, domestic services, and care work. In this paper, we document the gender division of work, drawing on a new harmonized data set that provides us with high-quality time use data for 50 countries spanning the global income distribution. A striking feature of the data is the wide dispersion across countries at similar income levels. We use these data to motivate a macroeconomic model of household time use in which country-level allocations are shaped by wages and a set of “wedges” that resemble productivity, preferences, and disutilities. Taking the model to country-level observations, we find that a wedge related to the disutility of market work for women plays a crucial role in generating the observed dispersion of outcomes, particularly for middle-income countries. Variation in the division of non-market work is principally shaped by a wedge indicating greater disutility for men, which is especially large in some low- and middle-income countries.
Keywords Labor supply, Home production, Care work, Time use, Gender inequality, Gender Norms
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Abstract Dynasties constitute a visible sign of intergenerational persistence and raise questions about the legitimacy of the ruling elite. This paper uses data on graduates of elite colleges to explore the influence of political and business dynasties in France. I link nominative data on 103,309 graduates of 12 French Grandes ´ Ecoles born between 1931 and 1975 to their professional careers as politicians with national-level mandates or as board members of French firms. Identifying lineage through surnames, I find that sons of political and business leaders were substantially more likely than their graduate peers to pursue elite careers themselves, revealing a social gradient in returns to elite education. Political dynasties were particularly sizeable, although progressively declining. These dynasties also affected the composition of the French elite: fewer dynastical board members were graduates of top colleges than their first-generation colleagues. Yet, they were propelled much younger into top business and political positions.
Keywords Politics, Business, Grandes Écoles, Elite Occupations, Intergenerational Mobility, Returns to College Education, Dynasties
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Abstract Troc Carbone Avion (TCA) est un mécanisme de répartition des quotas d’émissions pour les passagers Français du transport aérien assorti d’un mécanisme de troc au prix tutélaire du carbone de 100 € la première année et qui suit pour les années suivantes la trajectoire de croissance des prix définie dans le rapport Quinet II. En se basant sur les dernières données disponibles, chaque Français disposerait d’un quota d’émission de 0,4 tonne de carbone la première année. Le mode opératoire est une application du type TousAntiCovid avec QR code exigé au moment de l’enregistrement par les compagnies aériennes pour obtenir sa carte d’embarquement. Le compte carbone personnel serait rattaché à la possession de la nationalité française ou le fait de résider en France. Nous estimons que le TCA pourrait entraîner une baisse de 6 % du total des émissions la première année pour une valeur d’échange sur le marché de l’ordre d’1,5Md’€. Le TCA est aussi un mécanisme de transfert qui redistribue du pouvoir d’achat essentiellement du dernier décile au premier décile qui pourrait voir son pouvoir d’achat augmenter de 0,5 %. Nous proposons une variante du TCA pour le rendre compatible et complémentaire du système d’échange des quotas d’émission européen, SEQE-UE.
Keywords Redistribution, Permit, Emissions, Carbon, Airplane, Droits, Redistribution, Emissions, Carbone, Avion
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Abstract In this paper, we provide a simple framework to show the existence of stationary bubbles on dividend-yielding financial assets. These bubbles are compatible with a positive stationary fundamental value, rather than requiring its collapse in the long run. This result is obtained in an exchange overlapping generations economy with vintage financial assets that depreciate over time. New assets are introduced in each period, ensuring a constant aggregate supply of financial assets. Depreciation introduces a gap between the return of bubbles and the rate at which the dividends are discounted. Because the return of bubble can be lower or equal to the growth rate, we can have stationary equilibria with both a positive bubble and a positive fundamental value. Finally, our framework also allows us to discuss the role of the substitutability between financial assets on the level of bubbles and fundamental values.
Keywords Rational bubbles, Financial assets, Fundamental value
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Abstract This paper develops an overlapping generations model that links a public health system to a pay-as-you-go (PAYG) pension system. It relies on two assumptions. First, the health system directly finances curative health spending on the elderly. Second, public pensions partially depend on health status by introducing a component indexed to society's average level of old-age disability. Reducing the average disability rate in the economy then lowers pension benefits as the need to finance long-term care services also drops. We study the effects of introducing such a 'comprehensive' Social Security system on individual decisions, capital accumulation, and welfare. We first show that health investments can boost savings and capital accumulation under certain conditions. Second, if individuals are sufficiently concerned with their health when old, it is optimal to introduce a health-dependent pension system, as this will raise social welfare compared to a system where pensions are not tied to the society's average level of old-age disability. Our analysis thus highlights an important policy recommendation: making PAYG pension schemes partially health-dependent can be beneficial to society.
Keywords PAYG Pension System, Disability, Overlapping generations, Long-term care, Curative Health Investments
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Abstract We present an overview of selected contributions of the Journal of Mathematical Economics' authors in the last half century. We start with the classical optimal growth theory within a benchmark multisector model and outline the successive developments in the analysis of this model, including the turnpike theory. Different refinements of the benchmark are considered along the way. We after survey the abundant literature on endogenous fluctuations in two-sector models. We conclude with two strong trends in the recent growth literature: green growth and infinite-dimensional growth models.
Keywords Infinite-dimensional growth models, Optimization, Green growth, Turnpike theory, Multisector models, Growth theory
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Abstract This paper derives closed-form solutions for a strategic, simultaneous harvesting in a predator-prey system. Using a parametric constraint, it establishes the existence and uniqueness of a linear feedback-Nash equilibrium involving two specialized fleets and allow for continuous time results for a class of payoffs that have constant elasticity of the marginal utility. Theses results contribute to the scarce literature on analytically tractable predator-prey models with endogenous harvesting. A discussion based on industry size effects is provided to highlight the role played by biological versus strategic interactions in the multi-species context.
Keywords Predator-prey relationship, Common-pool resource, Dynamic games, Fisheries
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Abstract The assessment of binary classifier performance traditionally centers on discriminative ability using metrics, such as accuracy. However, these metrics often disregard the model's inherent uncertainty, especially when dealing with sensitive decision-making domains, such as finance or healthcare. Given that model-predicted scores are commonly seen as event probabilities, calibration is crucial for accurate interpretation. In our study, we analyze the sensitivity of various calibration measures to score distortions and introduce a refined metric, the Local Calibration Score. Comparing recalibration methods, we advocate for local regressions, emphasizing their dual role as effective recalibration tools and facilitators of smoother visualizations. We apply these findings in a real-world scenario using Random Forest classifier and regressor to predict credit default while simultaneously measuring calibration during performance optimization.
Keywords Calibration, Binary classification, Local regression
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Abstract Can forced sterilization programs targeting men lead to male-perpetrated violence? This paper investigates the impact of a government-mandated male sterilization program introduced in India on the rise of violence. Launched in April 1976, the program predominantly targeted men and saw heterogeneous implementation across India over 10 months. Using various household surveys and newly digitized historical data sources, we study whether the program triggered unintended effects on violence, measured by crime rates. Using a difference-indifferences strategy by exploiting geographical variation in coercion intensity, we find that an increase in exposure to the program led to an increase in violent crime rates of 7% for the average district, which persisted over time. Violent crimes against women primarily drive the increase in crime rates, as rapes are increasing by 22% for the average district. We find that the program was ineffective in reducing fertility, so we hypothesize that a forced sterilization program targeting men may increase violence against women through two main channels: the program inducing trauma and impacting perceptions of masculinity. In line with those channels, we see that districts with high coercion intensity correlate with more harmful gender norms: higher levels and acceptance of Intimate Partner Violence, lower bargaining power of women and lower contraception adoption.
Keywords Persistence, Gender, Violence, Male Sterilization
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Abstract This paper investigates the dynamic effects of weather shocks on monthly agricultural production in Peru, using a Local Projection framework. An adverse weather shock, measured by an excess of heat or rain, always generates a delayed negative downturn in agricultural production. The magnitude and duration of this downturn depend on several factors, including the type of crop and the timing of the shock. On average, a weather shock—a temperature shock—can cause a monthly decline of 5% to 15% in agricultural production. The response exhibit important heterogeneity across time, crop, and season dimensions, with hysteresis suggesting farmers’ adaptation over time. At the macroeconomic level, weather shocks are recessionary and entail a decline in inflation, agricultural production, exports, exchange rate and GDP.
Keywords Weather shocks, Agriculture, Local projections, VAR
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Abstract This paper shows how to recover behavioral biases from revealed preference ranking implied by choices. The approach formalizes and unifies known behavioral models, including salience thinking, inattention, and logarithmic perception, thereby accounting for many well-documented choice puzzles. I show that this approach provides a way to filter out choice data from behavioral biases explaining rationality breaches before fitting parametric utility models. The approach is applied to workhorse data sets of the literature on choice under risk and scanner consumer choices.
Keywords Decision Theory, Revealed Preference, Behavioral economics
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