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<!DOCTYPE html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Nathan Vieira </title>
<link rel="shortcut icon" href="amse-arms.ico" type="image/x-icon">
<link rel="icon" href="amse-arms.ico" type="image/x-icon">
<link href="https://fonts.googleapis.com/css?family=Lato:300,400,700,900" rel="stylesheet">
<link rel="stylesheet" href="libs/font-awesome/css/font-awesome.min.css">
<link href="css/bootstrap.min.css" rel="stylesheet">
<link href="css/styles.css" rel="stylesheet">
</head>
<body>
<div id="mobile-menu-open" class="shadow-large">
<i class="fa fa-bars" aria-hidden="true"></i>
</div>
<!-- End #mobile-menu-toggle -->
<header>
<div id="mobile-menu-close">
<span>Close</span> <i class="fa fa-times" aria-hidden="true"></i>
</div>
<ul id="menu" class="shadow">
<li>
<a href="#about">About</a>
</li>
<li>
<a href="#experience">News</a>
</li>
<li>
<a href="#education">Teaching</a>
</li>
<li>
<a href="#projects">Research</a>
</li>
<li>
<a href="#skills">Tools</a>
</li>
<li>
<a href="#contact">Contact</a>
</li>
</ul>
</header>
<!-- End header -->
<div id="lead">
<div id="lead-content">
<h1>Nathan Vieira</h1>
<h2>Post-doctoral Research Fellow</h2>
<a href="https://drive.google.com/file/d/1WOBQ8xix6byVh8LGFJaflWEGnPSjjVw-/view?usp=sharing" target="_blank" download="CV.pdf" class="btn-rounded-white">Download Resume</a>
</div>
<!-- End #lead-content -->
<div id="lead-overlay"></div>
<div id="lead-down">
<span>
<i class="fa fa-chevron-down" aria-hidden="true"></i>
</span>
</div>
<!-- End #lead-down -->
</div>
<!-- End #lead -->
<div id="about">
<div class="container">
<div class="row">
<div class="col-md-4">
<br>
<img src="images/tete_ronde.jpg" />
</div>
<div class="col-md-8">
<h2 class="heading">About Me</h2>
<p style="margin-bottom: 1.2em;">
I am on the 2025-2026 job market, please find my JMP <a href="https://drive.google.com/file/d/1KZiT1h9kNPnlgoUp7Bk18kD2xCQFRcu5/view?usp=sharing">here</a>
(<a href="https://drive.google.com/file/d/1VB7M39q4fykRztedp_f98XnJDuyFOaqA/view?usp=drive_link">slides</a>).
</p>
<p style="margin-bottom: 1.2em;">
I am a Postdoctoral Research Fellow at Université Grenoble Alpes
(sponsored by <a href="https://gael.univ-grenoble-alpes.fr/fr/sandrine-mathy">S.Mathy</a>),
working on an information experiment that measures the causal impact of health information on mode choice.
</p>
<p style="margin-bottom: 1.2em;">
I hold a PhD in Economics from the <a href="https://www.amse-aixmarseille.fr">Aix-Marseille School of Economics</a>
(under the supervision of <a href="https://sites.google.com/site/brunodecreuseecon/home">Bruno Decreuse</a>).
My thesis focus on the design and the effects of Short-Time Work programs.
</p>
<p style="margin-bottom: 1.2em;">
I held positions as a Visiting Researcher at the Paris School of Economics, the ETH Zurich and the University of Konstanz.
</p>
<p style="margin-bottom: 1.2em;">
My research focuses on public economics and labor-market.
</p>
</div>
</div>
</div>
</div>
<!-- End #about -->
<div id="experience" class="background-alt">
<h2 class="heading">News</h2>
<div id="experience-timeline">
<div data-date="December 2025">
<h3>Thesis Defense</h3>
<h4>Aix-Marseille School of Economics</h4>
<p>
I defended my PhD thesis entitled <i>Between distortions and flexibility: when and why short-time work policies are efficient?</i>
under the direction of Bruno Decreuse.
Jury: Pierre Cahuc, Sciences Po Paris ; Arnaud Cheron, Le Mans Université ; Camille Hemet, Université Paris 1 Panthéon-Sorbonn ; Céline Poilly, Aix-Marseille Université, AMSE
</p>
</div>
<div data-date="December 2025">
<h3>New Position</h3>
<h4>University Grenoble Alpes</h4>
<p>
I joined the University Grenoble Alpes as a Postodoctoral Research Fellow
to work on an information experiment that measures the causal impact of health information on mode choice
with <a href="https://sites.google.com/view/helene-bouscasse/accueil"> H.Bouscasse</a>,
<a href="https://gael.univ-grenoble-alpes.fr/fr/sandrine-mathy"> S.Mathy</a>,
<a href="https://sites.google.com/site/caroletreibich2/home"> C.Treibich</a>.
</p>
</div>
<div data-date="June 2025">
<h3>Conference Participation</h3>
<h4>RES 2025 Annual Conference</h4>
<p>
Presentation of the paper <i>The Deadweight Loss of Short-Time Work</i>.
</p>
<p>
Received the Best Paper Prize
</p>
<p>
Slides: <a href="https://drive.google.com/file/d/1VB7M39q4fykRztedp_f98XnJDuyFOaqA/view?usp=sharing">here</a>
</p>
</div>
</div>
</div>
<!-- End #experience -->
<div id="education">
<h2 class="heading">Teaching</h2>
<div class="education-block">
<h3>University of Aix-Marseille</h3>
<span class="education-date">2023 - 2024</span>
<h4>Bachelor of Economics</h4>
<p>
Macroeconomics II: To access TD, Exams, Tutorials and Corrections check out <a href="https://drive.google.com/drive/folders/1RhTFPtyXcCvI60IZV0QUsimnLTP7y4s3">Link</a>
</p>
<p>
Mathematics II: To access TD, Exams, Tutorials and Corrections check out <a href="https://drive.google.com/drive/folders/15GsPuoPF6yoT2_z_zugId9syv6DyraPZ">Link</a>
</p>
<p>
<a href="https://drive.google.com/drive/folders/1zrNOQWMpgg0EpV89KA-7iSLzNLfo8iYG?usp=drive_link">Teaching Ratings</a>
</p>
</div>
<!-- End .education-block -->
<div class="education-block">
<h3>University of Aix-Marseille</h3>
<span class="education-date">2022 - 2023</span>
<h4>Bachelor of Economics</h4>
<p>
Macroeconomics II: <a href="https://drive.google.com/drive/folders/1pj-yFE93AFuXziUA10Tbdox9bB91DJK3?usp=sharing">Exams and corrections</a>
</p>
<p>
Mathematics II: <a href="https://drive.google.com/drive/folders/1pj-yFE93AFuXziUA10Tbdox9bB91DJK3?usp=sharing">Exams and corrections</a>
</p>
<p>
<a href="https://drive.google.com/drive/folders/1zrNOQWMpgg0EpV89KA-7iSLzNLfo8iYG?usp=drive_link">Teaching Ratings</a>
</p>
</div>
<!-- End .education-block -->
</ul>
</div>
<!-- End .education-block -->
</div>
<!-- End #education -->
<div id="projects" class="background-alt">
<div class="container">
<div class="row">
<h2 class="heading">Publication</h2>
<p style="text-align: left;">
The Heterogeneous Impact of Short-Time Work: From Saved Jobs to Windfall E ffects.
(with Pierre Cahuc, Francis Kramarz & Sandra Nevoux)
<i>Journal of the European Economic Association</i>
(forthcoming)
</p>
</div>
</div>
</div>
</div>
<div id="projects" class="background-alt">
<h2 class="heading">Research Project</h2>
<div class="container">
<div class="row">
<div class="project shadow-large">
<div class="project-image">
<img src="images/deadweight_3D.jpg" />
</div>
<!-- End .project-image -->
<div class="project-info">
<h3>The Deadweight Loss of Short-Time Work (JMP)</h3>
<p>
Since the Great Recession, OECD countries have increased the generosity of short-time work (publicly subsidised reductions in working hours) in order to reduce employment fluctuation along business cycles. Using local projections and a novel narrative dataset for France, I show that past reductions in the cost paid by firms for using short-time work have increased the programme's deficit and reduced the number of hours worked by registered workers, while having a modest effect on unemployment. I construct a labour market and calibrate it using French data. Results show that a 50% increase in the cost of using short-time work would raise the social welfare of short-time worker by 25% and almost cancel the public deficit generated by the programme while having a small effect on employment.
</p>
<a href="https://drive.google.com/file/d/1VB7M39q4fykRztedp_f98XnJDuyFOaqA/view?usp=sharing">Slides</a> | <a href="https://drive.google.com/file/d/1KZiT1h9kNPnlgoUp7Bk18kD2xCQFRcu5/view?usp=sharing">Draft</a> | <a href="https://drive.google.com/file/d/1DPRphmoDKkPq7K1RyoLS2oSDSXBDbBWj/view?usp=sharing">Poster</a> | <a href="https://cepr.org/voxeu/voxtalks">Media Coverage</a>
</div>
<!-- End .project-info -->
</div>
<!-- End .project -->
<div class="project shadow-large">
<div class="project-image">
<img src="images/Coefplot_3D.jpg" />
</div>
<!-- End .project-image -->
<div class="project-info">
<h3>The Heterogeneous Impact of Short-Time Work</h3>
<p>
To understand which firms take-up short-time work and which workers they enroll in this program, we provide a model which shows that short-time work may save jobs in firms hit by strong negative revenue shocks, but not in less severely-hit firms, where hours worked are reduced, without saving jobs. Using detailed data on the administration of the program covering the universe of French establishments in the 2008-2009 Great Recession, we find that short-time work did indeed save jobs and increase hours of work in firms faced with large negative shocks. We also provide evidence of large windfall effects which significantly increased the cost of the policy per job saved; yet we also find that short-time work remains more cost-efficient at saving jobs than wage subsidies.
</p>
<a href="https://cepr.org/active/publications/discussion_papers/dp.php?dpno=16168">WP</a>
</div>
<!-- End .project-info -->
</div>
<!-- End .project -->
<div class="project shadow-large">
<div class="project-image">
<img src="images/Event_3D.jpg" />
</div>
<!-- End .project-image -->
<div class="project-info">
<h3>The Role of Chinese State-Owned Enterprises in Implementing Five-Year Plans</h3>
<p>
State-owned enterprises in China are far more numerous and larger than in other countries. One explanation for the number and size of Chinese SOEs is that they are used by the Chinese government to manage the Chinese economy. In this paper, we use Chinese firm-level data in a difference-in-difference framework to examine how China implements its industrial policy, focusing on the role of SOEs in the 10<sup>th</sup> Five Year Plan. We find that China relied on state-owned enterprises to achieve higher average productivity in the sectors supported by the plan. To understand the source of this productivity increase, we examine different forms of government support received by different types of firms.
</p>
<a href="https://drive.google.com/file/d/1d022rqD2b1_PgjyCsH3K9YAencqW0KCp/view?usp=sharing">Slides</a> | <a href="https://drive.google.com/file/d/1-mTBh6DT9EHq9SprmcVN400-e7UH83KC/view?usp=sharing">Draft</a>
</div>
<!-- End .project-info -->
</div>
<!-- End .project -->
<div class="project shadow-large">
<div class="project-image">
<img src="images/Path_3D.jpg" />
</div>
<!-- End .project-image -->
<div class="project-info">
<h3>Short-Time Work and Great Recession: Evidence of a ''French Miracle''</h3>
<p>
Many European countries introduced or expanded short-time work (STW) programmes in response to the COVID-19 recession, hoping to replicate the success of Germany’s approach during the Great Recession. This paper shows that the “German miracle” can be achieved outside of Germany. Using French firm-level data and an instrumental variables strategy, I find that STW effectively preserved employment during the Great Recession and led to higher program take-up in the subsequent recovery. By maintaining employment during the downturn, firms retained their accumulated human capital, which in turn enabled them to recover faster after the crisis. </p>
<a href="https://drive.google.com/file/d/1Xgkp9KnwpRsHq3Sr3daidRDYdxcfRqA6/view?usp=sharing">Slides</a> | <a href="https://drive.google.com/file/d/15xA2ONSMsyvaZ-Ps2febqR92UkDMuzSd/view?usp=sharing">Draft</a>
</div>
<!-- End .project-info -->
</div>
<!-- End .project -->
<div class="project shadow-large">
<div class="project-image">
<img src="images/JR-3D.jpg" />
</div>
<!-- End .project-image -->
<div class="project-info">
<h3>A Macroeconomic Approach to Optimal Job Retention</h3>
<p>
This paper develops a theory of optimal job retention in a dynamic matching model. Optimal job retention sets a minimum productivity below which a match should be terminated. This productivity depends on the output gain that would be generated by moving a worker to another job, plus a correction term that depends on the efficiency of labor market tightness. If the effect of job retention on tightness through job destruction is straightforward, the effect on job creation is more ambiguous and depends on the modelisation of expected firm matching profit. Increasing job retention can increase job creation by increasing the duration of each match or decrease job creation by increasing the tax on labor to retain low-productive jobs.
</p>
<a href="https://drive.google.com/file/d/1d022rqD2b1_PgjyCsH3K9YAencqW0KCp/view?usp=drive_link">Slides</a> | <a href="https://drive.google.com/file/d/1OqoScjTrRMfnbCoKTKQWTNarSqsiR1D3/view?usp=sharing">Draft</a>
</div>
<!-- End .project-info -->
</div>
<!-- End .project -->
</div>
</div>
</div>
<!-- End #projects -->
<div id="skills">
<h2 class="heading">Tools</h2>
<ul>
<li>Search & Matching</li>
<li>Dynamic Optimal Control</li>
<li>IV</li>
<li>DID</li>
<li>Local Projection</li>
<li>Path Analysis</li>
<li>Matching</li>
<li>Matlab</li>
<li>Dynare</li>
<li>Stata</li>
<li>Python</li>
</ul>
</div>
<!-- End #skills <li>DiD</li>
<!--<li>Search Matching</li>
<li>Dynamic Optimal Control</li>
<li>IV</li>
<li>DiD</li>
<li>Local Projection</li>
<li>Path Analysis</li>
</ul>
</div>
End #Tools -->
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