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on Dynamic General Equilibrium |
| By: | Biais, Bruno; Rochet, Jean-Charles; Villeneuve, Stéphane |
| Abstract: | In our dynamic general equilibrium model, agents can invest in money and in a production technology exposed to shocks. If the government is non-benevolent and has a monopoly over money issuance it issues too much money, to finance excessive public expenditures. We study the effects of a cryptocurrency in limited supply but with crash risk. If the crash risk is not too large, competition from the cryptocurrency constrains the government’s monetary policy. If the government is non-benevolent, this constraint improves citizens welfare, but if the government is rather benevolent competition from the cryptocurrency can lower citizens’ welfare. |
| Date: | 2025–05–22 |
| URL: | https://d.repec.org/n?u=RePEc:tse:wpaper:130554 |
| By: | Margaret M. Jacobson |
| Abstract: | Endogenously optimistic beliefs about future house prices can account for the increase, time-path, and volatility of house prices in the U.S. housing boom of the 2000s without shocks to housing preferences. In a general equilibrium model with incomplete markets and aggregate risk, heterogeneous agents endogenously form beliefs about future house prices in response to shocks to fundamentals. When fundamentals like credit conditions loosen, agents can only partially revise up their beliefs, resulting in increasingly optimistic beliefs that are consistent with both novel and existing empirical evidence. Because endogenous beliefs are sensitive to policy interventions, how beliefs are formed in housing booms has direct implications for prudential policy. |
| Keywords: | Housing boom; Aggregate risk; Heterogeneous agents; Incomplete information |
| JEL: | E20 E30 C68 R21 |
| Date: | 2025–01–31 |
| URL: | https://d.repec.org/n?u=RePEc:fip:fedgfe:100028 |
| By: | Abdoulaye Ndiaye; Zhixiu Yu |
| Abstract: | Raising the retirement age is a common policy response when social security schemes face fiscal pressures. We develop and estimate a dynamic life cycle model to study optimal retirement and tax policy when individuals face health shocks and income risk and make endogenous retirement decisions. The model incorporates key features of Social Security, Medicare, income taxation, and savings incentives and distinguishes three channels through which health affects retirement: nonconvexities in labor supply due to health-dependent fixed costs of working, earnings reductions, and mortality risk. We estimate our model to match US microdata and show that labor supply nonconvexities play a dominant role in driving early retirement, making rigid increases in the retirement age welfare reducing. In contrast, more flexible policies, such as increasing the dependence of Social Security benefits on the claiming age, can improve welfare and pay for themselves with a fiscal surplus. We map a range of policy reforms to their marginal values of public funds (MVPFs), showing that certain incentives to delay claiming offer MVPFs of infinity while broad-based retirement age increases have negative willingness-to-pay. These findings offer novel retirement policy prescriptions and challenge the prevailing emphasis on raising the retirement age. |
| Keywords: | flexible retirement, optimal taxation, social security reform, life cycle model, health shocks, retirement decisions, marginal value of public funds (MVPF), labor supply nonconvexities, mortality risk, medicare |
| JEL: | H21 H55 J26 D15 |
| Date: | 2025 |
| URL: | https://d.repec.org/n?u=RePEc:ces:ceswps:_11904 |
| By: | Noguchi, Soma |
| Abstract: | This study examines a new pension system in which pension benefits increase in proportion to the number of children. We demonstrate that transitioning to this new pension system can be achieved as a Pareto improvement. Additionally, we show that under certain conditions, the population may not decline within this system. |
| Keywords: | OLG, fertility, PAYG, pension, population. |
| JEL: | D91 H55 J13 |
| Date: | 2025 |
| URL: | https://d.repec.org/n?u=RePEc:pra:mprapa:124685 |
| By: | Bruno Pellegrino; Enrico Spolaore; Romain Wacziarg |
| Abstract: | Observed international investment positions and cross-country heterogeneity in rates of return to capital are hard to reconcile with frictionless capital markets. In this paper, we develop a theory of international capital allocation: a multi-country dynamic spatial general equilibrium model in which the entire network of cross-border investment is endogenously determined. Our model features cross-country heterogeneity in fundamental risk, a demand system for international assets, and frictions that cause segmentation in international capital markets. We measure frictions affecting international investment and apply our model to data from nearly 100 countries, using a new dataset of international capital taxes and cultural, geographic and linguistic distances between countries (geopoliticaldistance.org). Our model performs well in reproducing the composition of international portfolios, the cross-section of home bias and rates of return to capital, and other key features of international capital markets. Finally, we carry out counterfactual exercises: we show that barriers to international investment reduce world output by almost 7% and account for nearly half of the observed cross-country differences in capital stock per employee. |
| Date: | 2025–05 |
| URL: | https://d.repec.org/n?u=RePEc:fda:fdaddt:2025-05 |
| By: | Ken-ichi Hashimoto; Yoshiyasu Ono; Matthias Schlegl |
| Abstract: | In this paper, we develop a small open economy model of secular stagnation that allows for both unemployment and underemployment. While unemployment results from the standard search and matching friction, underemployment in the form of an involuntary shortfall of working hours occurs under stagnation when households have a strong desire to save in the form of insatiable liquidity preferences. This secular stagnation equilibrium is characterized by persistent deflation and aggregate demand shortage. In this steady state, an improvement in the terms of trade reduces global demand for domestic products and lowers working hours, thereby exacerbating deflation and decreasing consumption and aggregate demand. Consequently, firm profits fall and unemployment worsens. These results are in sharp contrast to the case of a non-stagnant economy, where an improvement in the terms of trade increases consumption without affecting the employment rate. |
| Date: | 2025–05 |
| URL: | https://d.repec.org/n?u=RePEc:dpr:wpaper:1285 |
| By: | Giulio Bottazzi; Daniele Giachini; Eleonora Priori |
| Abstract: | We develop a general equilibrium production network model that spans two periods and incorporates heterogeneous households, firm-specific Cobb-Douglas production technologies, and a time-to-build mechanism for capital formation. Within this dynamic framework, we establish the existence and uniqueness of a competitive equilibrium and provide explicit analytical solutions for key economic variables. In particular, we derive closed-form expressions for the welfare and real interest rate effects of supply-side shocks occurring at different points in time. We calibrate the model using input-output data from the Italian economy, identifying key structural features such as the prominent roles of the real estate, food, and tourism-related sectors. We then extend the calibration to incorporate household heterogeneity by skill level and examine the consequences in terms of welfare and real interest rates of a climate-related productivity shock. This shock is sector-specific, time-dependent, and scaled according to differential exposure to climate risks. Our results show that climate-induced negative supply-side shocks generate disproportionate welfare losses for low-skilled households and induce nontrivial adjustments in real interest rates across sectors. |
| Keywords: | Production Network; Capital Formation; Heterogeneous Agents; Two-date Model |
| Date: | 2025–05–27 |
| URL: | https://d.repec.org/n?u=RePEc:ssa:lemwps:2025/22 |
| By: | Francesco Ferlaino |
| Abstract: | This study examines how different types of financial frictions influence household wealth and consumption inequality in response to a contractionary monetary policy shock. The analysis considers two key frictions: those affecting production firms and those related to household borrowing, both incorporated into a HANK model. The results suggest that frictions in the productive sector have a stronger impact on wealth inequality, whereas frictions in household borrowing lead to greater consumption dispersion relative to the counterfactual scenario. This divergence primarily arises from dynamics around the zero-wealth threshold, particularly the behavior of the household borrowing spread. |
| Keywords: | Heterogeneous agents; financial frictions; monetary policy; New Keynesian models; inequalities |
| JEL: | E12 E21 E44 E52 G51 |
| Date: | 2025–05 |
| URL: | https://d.repec.org/n?u=RePEc:sap:wpaper:wp263 |
| By: | Yannis Dafermos (Department of Economics, SOAS University of London); Andrew McConnel (Pollination Group); Maria Nikolaidi (School of Accounting, Finance and Economics, University of Greenwich); Servaas Storm (Delft University of Technology); Boyan Yanovski (Dr. Roolfs Vent Solaire GmbH) |
| Abstract: | Recent years have seen an increasing use of environmental dynamic stochastic general equilibrium (E-DSGE) models for analyzing the macroeconomic effects of the climate crisis. This paper explores to what extent these models are fit for purpose. We identify the limitations of the benchmark E-DSGE framework and explain how these limitations restrict the ability of this framework to meaningfully capture the macroeconomics of the climate crisis. We then explain how the assumptions behind these limitations can be relaxed, but argue that simply relaxing some of these assumptions in isolation is insufficient to address the problem. We therefore call for a broader use of other macroeconomic models, such as ecological stock-flow consistent (E-SFC) and ecological agent-based (E-AB) models, that address these limitations simultaneously. We explain how these models do not suffer from the pitfalls of the E-DSGE framework and outline how they need to improve to increase their usefulness as tools that can inform macroeconomic policy making in the Anthropocene. |
| Keywords: | climate crisis, DSGE modeling, stock-flow consistent modeling, agent-based modeling, green macroeconomic policies, green finance |
| JEL: | E10 E20 E40 E50 E60 |
| Date: | 2024–10–12 |
| URL: | https://d.repec.org/n?u=RePEc:thk:wpaper:inetwp229 |
| By: | Dibiasi, Andreas (ETH Zürich); Mikosch, Heiner (ETH Zürich - KOF Swiss Economic Institute); Sarferaz, Samad (ETH Zurich); Steinbach, Armin (HEC Paris; Max Planck Institute for Research on Collective Goods) |
| Abstract: | In a novel survey, we study how German senior government officials systematically adjust fiscal policy in response to economic shocks, focusing on their fiscal responses to a contractionary monetary policy shock. Using randomized vignette treatments, we examine how officials update GDP and inflation expectations under fiscal and monetary policy shock scenarios and assess their preferred fiscal adjustments. Our findings show that officials predominantly respond by increasing debt and reducing spending, with tax increases playing a minor role, often combining multiple fiscal instruments. Counterfactual analysis reveals that officials’ reasoning aligns with key insights from the Heterogeneous Agent New Keynesian literature. |
| Keywords: | Fiscal policy; monetary policy; fiscal-monetary interaction; expectation formation; survey experiment |
| JEL: | E62 |
| Date: | 2025–02–10 |
| URL: | https://d.repec.org/n?u=RePEc:ebg:heccah:1546 |
| By: | Ge, Teng Ge (Oxford Brookes Business School, Oxford Brookes University); Moghaddasi Kelishomi, Ali (School of Business, Loughborough University) |
| Abstract: | Rising income inequality poses significant challenges to housing affordability. Using a general equilibrium search model with heterogeneous buyers and sellers, this study explores the relationship between income inequality and housing market outcomes. Our theoretical framework unveils three distinct equilibria: affordable (integrated), pooled (partially segregated), and vertical (fully segregated). We demonstrate that a mean-preserving increase in income inequality leads the market to transition from an affordable matching equilibrium to a vertically segmented one, passing through a region of multiple equilibria where small shifts in fundamentals can generate large, discontinuous changes in market outcomes. Similar market dynamics are predicted by increasing the proportion of rich buyers. Through the externality related to the composition of sellers in the market, poor buyers are worse off and rich buyers are better off as the market transitions from affordable to vertical equilibria. Leveraging Chinese data, we illustrate the model’s applicability to real-world scenarios. Our findings have important policy implications, such as progressive taxation and redistribution, targeted affordable housing policies, and policy signalling, for addressing housing affordability challenges in an era of rising income inequality. |
| Keywords: | Income Inequality; Affordable Housing; Housing Price; Search and Matching JEL Classification: C78, D31, R13, R31 |
| Date: | 2025 |
| URL: | https://d.repec.org/n?u=RePEc:cge:wacage:753 |
| By: | Aurelien Eyquem (University of Lausanne, CH); Masashige Hamano (Waseda university, Tokyo, JP and Université du Luxembourg (Extramural Research Fellow)) |
| Abstract: | A tractable model with heterogeneous households is proposed to analyze the two-way interactions between demographic and macroeconomic variables. Total population and labor-market participation are both endogenous and affected by economic as well as demographic factors. We perform a quantitative exercise focusing on trend dynamics based on Japanese data. Our counterfactual analysis reveals the role of labor-market participation costs, sunk costs of raising newborns, and technology progress. |
| Keywords: | Heterogeneous workers, Aging, Productivity, Labor markets. |
| JEL: | E20 J11 J13 J21 |
| Date: | 2025 |
| URL: | https://d.repec.org/n?u=RePEc:luc:wpaper:25-06 |
| By: | Noguchi, Soma |
| Abstract: | This study investigates the effects of increased tax rates on fertility decisions, pension benefits, and unemployment benefits in an economy with both a pay-as-you-go (PAYG) pension system and unemployment insurance. By incorporating voluntary unemployment, the model highlights how higher tax rates reduce households’ willingness to work, thereby affecting the social security system through the production channel. The analysis also reveals differing impacts of the two types of labor income taxes. |
| Keywords: | OLG, fertility, PAYG, pension, unemployment. |
| JEL: | D91 H55 J13 J65 |
| Date: | 2025–05–05 |
| URL: | https://d.repec.org/n?u=RePEc:pra:mprapa:124671 |
| By: | Giovanni Favara; James Graham; Geng Li |
| Abstract: | Home-related spending in categories such as furnishings, renovations, and repairs is tied to housing market activity, with significant implications for aggregate expenditure dynamics. We refer to this relationship as the home purchase channel of expenditure. Using household-level panel data we estimate that home purchases lead to sizable increases in home-related spending, but not to increases in goods and services unrelated to home purchase. These findings are robust to the use of close-control groups and placebo tests. We then build a heterogeneous household model with housing, home renovations, and home-related durables that is calibrated to match our household-level evidence. Model simulations of housing market shocks generate large fluctuations in home-related and total expenditure. We show that the home purchase channel amplifies aggregate expenditure dynamics, with home-related spending accounting for around half of total spending fluctuations over the housing cycle. |
| Keywords: | housing, home purchase, household spending, housing cycle |
| JEL: | D12 D15 E21 E32 R31 |
| Date: | 2025–06 |
| URL: | https://d.repec.org/n?u=RePEc:een:camaaa:2025-32 |
| By: | Funke, Michael; Wende, Adrian |
| Abstract: | Following Russia's invasion of Ukraine in February 2022, the US, EU, and likeminded countries swiftly imposed an expanded set of primary and secondary export restrictions on Russia. This paper assesses the effectiveness of those measures and their ongoing refinement and modification over time using a calibrated three-country dynamic general equilibrium trade model with heterogeneous firm productivities. The modeling set-up comprises a rich specification of export ban loopholes and workarounds, as well as subsequent countermeasures such as re-exports, ghost trade, and secondary extraterritorial export bans. The numerical model evaluations and the numerous policy counterfactuals highlight the challenges of export ban evasion and offer insights for effective export ban designs in the future. We show that targeted secondary extraterritorial export bans have proven an impactful policy tool in diminishing Russia's imports of critical technologies. |
| Keywords: | Russia, export bans, sanctions evasion, quantitative trade model |
| JEL: | F12 F13 F51 H56 |
| Date: | 2025 |
| URL: | https://d.repec.org/n?u=RePEc:zbw:bofitp:318192 |
| By: | Rafael Lalive (University of Lausanne); Aderonke Osikominu (University of Hohenheim); Lorenzo Pesaresi (University of Zürich); Jeremy Zuchuat (University of Lausanne); Josef Zweimüller (University of Zurich) |
| Abstract: | The job finding rate declines with the duration of unemployment, but the relative importance of workers’ search behavior and employers’ recruitment behavior remains unclear. We use monthly search diaries from Swiss public employment offices to shed new light on this issue. Search diaries record each single application sent by a job seeker and indicate whether the employer followed up with an interview and a job offer. Based on more than 600, 000 applications sent by 15, 000 job seekers, we find that applications and interviews decrease, but job offers per interview increase with duration. A theoretical framework with endogenous search effort by workers and statistical discrimination by firms replicates the duration patterns of applications, interviews and job offers closely. The estimated model predicts that roughly half of the decline in the job finding rate is due to structural duration dependence and the other half to dynamic selection of the unemployment pool. Falling applications by job seekers – who internalize statistical discrimination by firms – are the main driver of duration dependence. |
| Keywords: | ob search, job finding, duration dependence, dynamic selection, searcheffort, job application, callback, job interview, job offer. |
| JEL: | J24 J64 |
| Date: | 2025–05 |
| URL: | https://d.repec.org/n?u=RePEc:crm:wpaper:2515 |
| By: | Xiao Ma (Peking University); Alejandro Nakab (Universidad Torcuato Di Tella); Daniela Vidart (University of Connecticut) |
| Abstract: | We investigate how on-the-job training varies with firm characteristics and how this informs the distribution of training costs between firms and workers. Using data from over 100 countries, we document that smaller firms consistently offer fewer training opportunities to their workers. Drawing on administrative data from China and Mexico, we identify differences in labor share and productivity levels as key factors explaining this pattern. We then build a general equilibrium model with various training costsharing schemes and show that only those in which firms bear a substantial share of training costs after hiring align with the empirical evidence. A quantitative version of the model calibrated to the US reveals significant inefficiencies in training provision, particularly among smaller firms, and suggests that (1) optimal training subsidies are higher for smaller firms, though even a uniform subsidy can raise net output by 7%; and (2) increasing the labor market share of larger firms can signifcantly impact on-the-job human capital formation. |
| Keywords: | On-the-job training; Human capital accumulation; Firm heterogeneity |
| JEL: | E24 J24 M53 |
| Date: | 2025–04 |
| URL: | https://d.repec.org/n?u=RePEc:uct:uconnp:2025-05 |
| By: | Stéphane Auray; Michael B. Devereux; Aurélien Eyquem |
| Abstract: | We quantify the macroeconomic effects of the tariff measures announced (but not entirely implemented yet) on Liberation Day (April 2nd, 2025) through the lens of a New-Keynesian two-country model calibrated to the US and the rest of the world. We study both a unilateral 10pp tariff increase and a global trade war scenario with retalia- tory tariffs of a similar magnitude. In either case, tariffs are always sharply contractionary for US GDP, increasing inflation and widening the trade deficit. Measured in welfare terms a unilateral tariff generates gains for the US due to a large terms of trade appreciation, but these US welfare gains vanish with global retaliation. Three features of the model are critical in the evaluation of the tariff impact - the asymmetry in size and openness between the US and the rest of the world, the endogenous response of monetary policy to the inflationary effects of tariffs, and the importance of trade in intermediate goods for the scale of the global response to a tariff shock. |
| JEL: | F30 F40 F41 |
| Date: | 2025–05 |
| URL: | https://d.repec.org/n?u=RePEc:nbr:nberwo:33739 |
| By: | Biais, Bruno; Gersbach, Hans; Rochet, Jean-Charles; von Thadden, Ernst-Ludwig; Villeneuve, Stéphane |
| Abstract: | We analyze dynamic capital allocation and risk sharing between a principal and many agents, who privately observe their output. The state variables of the mechanism design problem are aggregate capital and the distribution of continuation utilities across agents. This gives rise to a Bellman equation in an infinite dimensional space, which we solve with mean-field techniques. We fully characterize the optimal mechanism and show that the level of risk agents must be exposed to for incentive reasons is decreasing in their initial outside utility. We extend classical welfare theorems by showing that any incentive- constrained optimal allocation can be implemented as an equilibrium allocation, with appropriate money issuance and wealth taxation by the principal. |
| Date: | 2025–05–22 |
| URL: | https://d.repec.org/n?u=RePEc:tse:wpaper:130553 |
| By: | Jaanika Meriküll; Matthias Rottner |
| Abstract: | This paper studies the distributional effects of monetary policy and its dependence on inflation. We document a novel dependency in the earnings heterogeneity channel of monetary policy using high-frequency, administrative tax data from eurozone member Estonia. Monetary policy shocks substantially influence earnings inequality during high-inflation periods, with weaker effects during low-inflation periods. Extending our dataset with granular MPC estimates, we show that earnings heterogeneity amplifies the aggregate MPC and consumption response. In high-inflation periods, consumption and inequality respond more, even though the aggregate MPC may be lower. We rationalise our findings with a nonlinear tractable HANK model featuring inflation dependencies. |
| Keywords: | monetary policy, labour income inequality, inflation, state dependency, earnings heterogeneity channel, aggregate MPC |
| JEL: | E52 D31 J31 J63 |
| Date: | 2025–06 |
| URL: | https://d.repec.org/n?u=RePEc:bis:biswps:1271 |
| By: | Minki Kim |
| Abstract: | Malaria is the primary cause of child mortality and a barrier to childhood human capital accumulation in sub-Saharan Africa. This paper quantifies the macroeconomic consequences of malaria eradication using a structural model in which individuals endogenously respond to malaria by adjusting fertility and educational investment through the quantity-quality tradeoff. The model matches the empirical estimates from an anti-malaria campaign in Tanzania. The estimated per-capita income gain from eradication is substantial—nearly three times larger than previously reported— as healthier children acquire more human capital per year of schooling, and parents also invest more per child by lowering fertility. The results support accelerating the deployment of malaria vaccines. |
| Keywords: | Malaria, fertility, childhood human capital, quantity-quality trade-off, cross-country income difference |
| JEL: | O11 |
| Date: | 2025–06 |
| URL: | https://d.repec.org/n?u=RePEc:bon:boncrc:crctr224_2025_690 |