David Perez-Reyna
@davidperezreyna.bsky.social
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📥 12
📝 85
reposted by
David Perez-Reyna
Lucas Calderón
18 days ago
Creo que
@rodrigouprimny.bsky.social
y otros contradictores de las acciones de Trump con Maduro, tienen maravillosas oportunidades de demostrar que tienen razón: Liberen a Cuba de la dictadura, liberen a Nicaragua, liberen a El Salvador de sus dictaduras.
@missmelindres.bsky.social
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reposted by
David Perez-Reyna
Dana Scott
3 months ago
🚨 JOB MARKET PAPER ALERT! 🚨 Why do firms provide different workplace amenities? And how does amenity provision affect labor market inequality? 🧵
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Why price controls fail: A look at the economic fundamentals behind rent control and energy price caps, and what actually works to address affordability. Thread 🧵 1/5 1/5
2 months ago
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reposted by
David Perez-Reyna
Petter Törnberg
6 months ago
We built the simplest possible social media platform. No algorithms. No ads. Just LLM agents posting and following. It still became a polarization machine. Then we tried six interventions to fix social media. The results were… not what we expected.
arxiv.org/abs/2508.03385
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Can We Fix Social Media? Testing Prosocial Interventions using Generative Social Simulation
Social media platforms have been widely linked to societal harms, including rising polarization and the erosion of constructive debate. Can these problems be mitigated through prosocial interventions?...
https://arxiv.org/abs/2508.03385
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"Politicians abandoned such taxes because they did not work." "[I]mplementing a bad policy in order to achieve a good outcome is rarely a wise approach" Don’t tax wealth
www.economist.com/fi...
From The Economist
4 months ago
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Mi entrada más reciente en
#VocesDeEconomía
de @EconomiaUAndes Colombia necesita volver a ser "aburrida" económicamente. Durante décadas, nuestro país se destacó por baja volatilidad macroeconómica y crecimiento constante vs otros países latinoamericanos. Hilo 🧵 1/8
5 months ago
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Very nice blog entry by
@BrianCAlbrecht
Why do economists have "tariff derangement syndrome"? It's not politics—tariffs violate every principle of good taxation we've learned over the past century. 1/8
6 months ago
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La próxima persona que lidere Bogotá debería tener entre sus prioridades hacer que la ciudad sea más bonita. Bien alcalda Galán empezar con esta inicitiva 1/2
6 months ago
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Se puede bajar el gasto público sin comprometer la provisión de servicios públicos. Nueva entrada en
#VocesDeEconomía.
Enlace abajo 1/2
6 months ago
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¿esto es ser neoliberal? 1/2
6 months ago
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Colombia, te quiero tanto
6 months ago
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"The irony of labour-saving automation is that people often stand in the way." From @TheEconomist
6 months ago
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Autonomous vehicles should complement public transit, and automating transit should be a goal. Interesting entry by Hayden Clarkin (@the_transit_guy)
7 months ago
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New paper in @LAJCB_ with Angie Rozada-Najar and Fausto Suaza *1/6* While manufacturing firms typically exhibit negative assortative matching (productive firms connect with less productive ones), we find the opposite in credit markets.
8 months ago
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"Sustained growth, last seen over a decade ago, would provide the sharpest relief." From The Economist
8 months ago
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Si queremos ser como Dinamarca, puede ser bueno hacer lo que hace Dinamarca "Dinamarca aumentó la edad de pensión a 70 años, la cual regirá a partir de 2040" via La República (@larepublica_co)
8 months ago
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1/3 Buen blog de Brian Albrecht (
@BrianCAlbrecht
). Los experimentos de laboratorio del Nobel Vernon Smith sugieren que la economía se puede afrontar como se hace con la física - los estudiantes alcanzan el equilibrio consistentemente.
8 months ago
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1/7 🧵 New paper with Jorge Tovar (
@JorgeATovar
) and Tomás Rodríguez. When Colombian regulators introduced stricter liquidity rules (NSFR) in 2020, banks initially increased their market power before competition ultimately prevailed. Here's what happened... 🏦📊
8 months ago
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El formato de cuadrangulares en el torneo colombiano envía equipos más débiles a Copa Libertadores. Otro argumento para cambiar el formato. Enlace a la entrada con Daniel Franco (@francamente_13) más abajo
8 months ago
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"we show that counterfactual policies taking into account heterogeneity across sectors can deliver similar benefits from training while inducing less distortions in the firm-size distribution and in the allocation of resources across sectors."
onlinelibrary.wiley....
8 months ago
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"Voters should pay more attention to those with a good record of taking care of the rubbish bins"
www.economist.com/eu...
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Europe’s mayors are islands of liberalism in a sea of populists
City bosses are the functioning bits of increasingly dysfunctional polities
https://www.economist.com/europe/2025/05/22/europes-mayors-are-islands-of-liberalism-in-a-sea-of-populists
8 months ago
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#DosisDeOptimismo
ourworldindata.org/c...
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Children in rich countries are much less likely to die than a few decades ago, but we rarely hear about this progress
In most rich countries, child mortality has more than halved in the last thirty years; we know we can go further.
https://ourworldindata.org/child-mortality-rich-countries-decline?utm_source=OWID+Newsletter&utm_campaign=81a15b00a3-biweekly-digest-2025-05-16&utm_medium=email&utm_term=0_-0c7f305164-536765210
8 months ago
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Tariffs may help growth in low-debt economies but can destabilize high-debt ones by creating multiple potential economic outcomes, risking self-fulfilling market fluctuations.
www.sciencedirect.co...
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On the (de)stabilization role of protectionism
To what extent protectionism affects growth and (de)stabilizes the economies? Although the impact of protectionism on growth has been widely explored …
https://www.sciencedirect.com/science/article/pii/S0304406824000557
9 months ago
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reposted by
David Perez-Reyna
10 months ago
I am excited to see whether this will work. Irrespective of that, I think journals should experiment more with the publication process.
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Standardized tests predict college success better than GPAs at elite schools and may actually help disadvantaged students - contrary to critics' claims.
www.economist.com/un...
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America’s progressives should love standardised tests
New evidence in a long-running argument
https://www.economist.com/united-states/2025/04/16/americas-progressives-should-love-standardised-tests
9 months ago
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History shows recessions can boost productivity through 'cleansing' effects, but deliberately engineering one is economic malpractice. A tariff-induced downturn won't replicate the natural selection of market forces—it'll just cause unnecessary pain.
open.substack.com/pu...
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Will a recession raise productivity?
Probably not. But, historically, U.S. recessions often have.
https://open.substack.com/pub/pricetheory/p/will-a-recession-raise-productivity?utm_source=share&utm_medium=android&r=486pr
10 months ago
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"Slowly but surely, ai is helping turn brown to green." #DosisDeOptimismo
www.economist.com/sc...
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AI models are helping dirty industries go green
Mining companies and steelmakers are feeling the benefits
https://www.economist.com/science-and-technology/2025/04/10/ai-models-are-helping-dirty-industries-go-green
10 months ago
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reposted by
David Perez-Reyna
Pau S. Pujolas
about 1 year ago
Just uploaded the newest version of "Trade Deficits with Trade Wars," which I wrote with Jack Rossbach.
papers.ssrn.com/sol3/papers....
Bilateral trade deficits make trade wars more winneable. Action by policymakers is needed to prevent a new world trade collapse.
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Trade Wars with Trade Deficits
<div> Trade imbalances significantly alter the welfare implications of tariffs. Using an illustrative <span>model, we show that trade deficits enhance a c
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5008591
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VAT isn't an export subsidy! Rebates ensure each country taxes only local consumption. Both foreign and domestic products face identical tax treatment in each market. #EconFacts
open.substack.com/pu...
#EconFacts
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Stop saying a value-added tax is an export subsidy
It's not. No matter how many times people (even economists) say they are.
https://open.substack.com/pub/pricetheory/p/stop-saying-a-value-added-tax-is?utm_source=share&utm_medium=android&r=486pr
10 months ago
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# Interest Rate Caps Paradox: A new bill claiming to lower credit card costs to 10% may actually increase total borrowing costs through non-price competition. Price theory explains why this well-intentioned policy backfires. #Economics #FinancialLiteracy
open.substack.com/pu...
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Do Lower Legal Interest Rates Actually Reduce Borrowing Costs?
The problem with maximum interest rates is that they increase the marginal cost of borrowing
https://open.substack.com/pub/pricetheory/p/do-lower-legal-interest-rates-actually?utm_source=share&utm_medium=android&r=486pr
10 months ago
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"many policies aimed at easing pressure in rental markets have been treating the symptoms of the problem rather than the cause. They have thereby ended up making things worse for the people they were meant to help."
www.economist.com/le...
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If you can’t find a place to rent, blame the government
Foolish crusades against landlords have made housing shortages worse
https://www.economist.com/leaders/2025/03/20/if-you-cant-find-a-place-to-rent-blame-the-government
10 months ago
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A los equipos colombianos les va mal en libertadores porque, entre otras cosas, el torneo local desincentiva que los mejores equipos clasifiquen
golyfutbol.com/post/...
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Un torneo con sistema de liga premia a nuestro equipos · Gol y Fútbol
Analítica de datos del fútbol: Estadística, economía y también mucha historia del deporte rey.
https://golyfutbol.com/post/2025/03/18/un-torneo-con-sistema-de-liga-premia-a-nuestro-equipos/
10 months ago
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" we show that the policy increased speeds in the CBD, had spillovers onto non-CBD roads, and reduced estimated vehicle emissions throughout the metro area.[...]average traffic speeds[...] increased by 15% following the introduction of congestion pricing"
www.nber.org/papers/...
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The Short-Run Effects of Congestion Pricing in New York City
Founded in 1920, the NBER is a private, non-profit, non-partisan organization dedicated to conducting economic research and to disseminating research findings among academics, public policy makers, and business professionals.
https://www.nber.org/papers/w33584?utm_campaign=ntwh&utm_medium=email&utm_source=ntwg6
10 months ago
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📊 Prices aren't problems—they're signals wrapped in incentives. They communicate scarcity while motivating solutions. When politicians cap prices, they shoot the messenger and eliminate both information and incentives needed to solve the real issues.
open.substack.com/pu...
11 months ago
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Conditional cash transfers can lead to suboptimal decisions. Unconditional cash transfers are a better option, in my opinion.
www.economist.com/br...
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Paying teenagers to go to school was a bad idea
At least in Britain
https://www.economist.com/britain/2025/02/27/paying-teenagers-to-go-to-school-was-a-bad-idea
11 months ago
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"Building enough houses in the right place is the single biggest action governments can take to restore the link between work and wealth."
www.economist.com/le...
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Inheriting is becoming nearly as important as working
More wealth means more money for baby-boomers to pass on. That is dangerous for capitalism and society
https://www.economist.com/leaders/2025/02/27/inheriting-is-becoming-nearly-as-important-as-working
11 months ago
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La mala gestión fiscal del Gobierno colombiano. En 16 meses pasamos de preguntarnos "¿Chao regla fiscal?" a confirmar su violación por $26 billones. Ahora un día de cada 20 de actividad económica nacional se destina solo a pagar intereses de deuda.
www.elespectador.com...
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Pintar la fachada
En octubre de 2023, en este mismo espacio, comencé una columna con una premisa.
https://www.elespectador.com/opinion/columnistas/marc-hofstetter/pintar-la-fachada/
11 months ago
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With inelastic supply (can't quickly produce more eggs) and demand (eggs are essential), even small disruptions cause big price jumps. High profits at producers like Cal-Maine reflect scarcity, not necessarily market manipulation.
open.substack.com/pu...
11 months ago
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conference.nber.org/...
"We find that road pricing alone leads to large welfare gains by reducing externalities, but at the expense of travelers, whose surplus falls even if road pricing revenues are fully rebated."
12 months ago
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Para Colombia, EEUU y el mundo "We should judge political movements not just on their policy goals but on whether they maintain the stable framework that makes economic calculation possible."
open.substack.com/pu...
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Chaos kills coordination
Economic calculation requires more than just monetary stability
https://open.substack.com/pub/pricetheory/p/chaos-kills-coordination?utm_source=share&utm_medium=android&r=486pr
12 months ago
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"Family policies can affect family planning through financial incentives"
add a skeleton here at some point
12 months ago
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"We show that asymmetric information and distributional considerations together make voters wary of policies supported by others. This force impels a majority of voters to support policies contrary to their preferences and information"
www.econometricsocie...
12 months ago
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"American generosity is not just charity. Foreign aid that creates a more stable and richer world is in America’s greatest interest. Call it America First if you like. "
www.economist.com/le...
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By cutting off assistance to foreigners, America hurts itself
Donald Trump’s chaotic aid freeze makes his country weaker
https://www.economist.com/leaders/2025/01/30/by-cutting-off-assistance-to-foreigners-america-hurts-itself
12 months ago
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"Has corporate greed driven inflation in the European Union?" Short answer: no
www.sciencedirect.co...
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Has corporate greed driven inflation in the European Union? An analysis of the food and beverage industry
The EU has recently experienced high inflation rates, particularly in food prices. This observation led to claims in the news and by retailers that la…
https://www.sciencedirect.com/science/article/pii/S0165176525000011
12 months ago
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¿Se aplicará a las "ías"?
about 1 year ago
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“We must not repose in fancied security that we can for ever sell everything and buy little or nothing,” he [President McKinley] announced in Buffalo, New York, in 1901, before adding that “commercial wars are unprofitable” Do tariffs raise inflation?
www.economist.com/fi...
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Do tariffs raise inflation?
Usually. But the bigger problem is that they harm economic growth and innovation
https://www.economist.com/finance-and-economics/2025/01/23/do-tariffs-raise-inflation
about 1 year ago
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¿El mismo mecanismo seguirá funcionando hoy en día? E.g. países que construyen nuevas capitales
add a skeleton here at some point
about 1 year ago
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reposted by
David Perez-Reyna
Peter Hull
about 1 year ago
Some things I've learned in 2024: 1. A jail-based education program in Flint MI which emphasizes rehabilitation and improved jail culture dramatically reduced misconduct and recidivism (More:
www.dropbox.com/scl/fi/ep5xy...
)
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"America urgently needs regulations and insurance markets that create the right incentives by promoting cost-effective ways to harden homes and encouraging people to live in safer places." Much of the damage from the LA fires could have been averted
www.economist.com/le...
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Much of the damage from the LA fires could have been averted
The lesson of the tragedy is that better incentives will keep people safe
https://www.economist.com/leaders/2025/01/15/much-of-the-damage-from-the-la-fires-could-have-been-averted
about 1 year ago
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reposted by
David Perez-Reyna
Jeff Ely
about 1 year ago
three things editors can do: (i dont think theres much hope for changing what referees do.) /3
add a skeleton here at some point
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