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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">Projects</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>PhD Candidate</h2>
<a href="./CV.pdf" 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>
I am a Ph.D candidate in Economics at <a href="https://www.amse-aixmarseille.fr">Aix-Marseille School of Economics</a> (Aix-Marseille University) in France, under the supervision of <a href="https://sites.google.com/site/brunodecreuseecon/home">Bruno Decreuse</a>.
</p>
<p>
My primary field is Labor Economics. My thesis focus on the design and the effects of Short-Time Work programs.
</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="April - Mai 2024">
<h3>Visiting at Paris School of economics</h3>
<h4>Sponsored by C.Hémet</h4>
<p>
2 months research stay sponsored by C.Hémet on short-time work and the cleansing effect of recessions
</p>
</div>
<div data-date="April 2024">
<h3>Poster Presentation</h3>
<h4>Paris School of Economics</h4>
<p>
Find the poster of the JMP <a href="./Poster.pdf">here</a>
</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">
<h2 class="heading">Projects</h2>
<div class="container">
<div class="row">
<div class="project shadow-large">
<div class="project-image">
<img src="images/STW3_3D.jpg" />
</div>
<!-- End .project-image -->
<div class="project-info">
<h3>The Deadweight Loss of Short-Time Work (JMP)</h3>
<p>
This paper combines macroeconomic evidence and modelling to identify and quantify the effect of incentives to use short-time work on employer-employee matching. Using local projections and a novel dataset for France, I show that past reductions in the cost of using short-time work have increased the programme's deficit and reduced the number of hours worked by enrolled employers, while having a modest effect on unemployment. I construct and calibrate a labour market with hours to show that strong incentives to use short-time work negatively affect total output produced, creating a deadweight loss to the economy financed by the public deficit. I find that the current cost is 50% lower than the optimum and that increasing the cost of short-time work to its optimal value would increase the surplus produced by short-time workers by 25%.
</p>
<a href="https://drive.google.com/file/d/14Mme8_hrHFdGIQBdI9xX91o6sKINA7NJ/view?usp=sharing">Draft</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/Path_3D.jpg" />
</div>
<!-- End .project-image -->
<div class="project-info">
<h3>Short-Time Work Policy: Evidence of a ''French Miracle''</h3>
<p>
Many European countries have implemented short-time work policies in the face of the COVID-19 recession, hoping to achieve the same success after the role of short-time work programs in the German miracle during the Great Recession. In this paper, I show that short-time work program can also lead to a German miracle outside Germany. Using French firm-level data, I find that the French short-time work program preserved employment during the Great Recession and allowed for a higher take-up afterwards. By saving employment during the recession, firms consuming STW preserved their accumulated human capital, which allowed them to be more productive after the crisis.
</p>
<a href="https://drive.google.com/file/d/13Fx25Ec5U5lpECLy8Hb_WpqcZAkpMhjn/view?usp=sharing">Draft</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/1-mTBh6DT9EHq9SprmcVN400-e7UH83KC/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 -->
<div id="contact">
<h2>Get in Touch</h2>
<div id="contact-form">
<form method="POST" action="https://formspree.io/nathan.vieira@univ-amu.fr">
<input type="hidden" name="_subject" value="Contact request from personal website" />
<input type="email" name="_replyto" placeholder="Your email" required>
<textarea name="message" placeholder="Your message" required></textarea>
<button type="submit">Send</button>
</form>
</div>
<p>
</p>
<div class="google-map">
<iframe src="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d2893.7127976684233!2d5.448864699999999!3d43.5083266!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x12c98d36ee5e4609%3A0xd82fb20644f09904!2sMEGA%20(%20la%20Maison%20de%20l'Economie%20et%20de%20la%20Gestion%20d'Aix-en-Provence%20)!5e0!3m2!1sen!2sfr!4v1719496847903!5m2!1sen!2sfr" width="600" height="450" style="border:0;" allowfullscreen="" loading="lazy" referrerpolicy="no-referrer-when-downgrade"></iframe>
</div>
<!-- End #contact-form -->
</div>
<!-- End #contact -->
<footer>
<div class="container">
<div class="row">
<div class="col-sm-5 copyright">
<p>
Copyright © <span id="current-year">2025</span> VIEIRA
</p>
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<i class="fa fa-chevron-up" aria-hidden="true"></i>
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<a href="https://github.com/NathanVieira38" target="_blank"><i class="fa fa-github" aria-hidden="true"></i></a>
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<a href="https://x.com/Vieira_Nathan_" target="_blank"><i class="fa fa-twitter" aria-hidden="true"></i></a>
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<a href="mailto:nathan.vieira@univ-amu.fr" target="_blank"><i class="fa fa-envelope" aria-hidden="true"></i></a>
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