Sign in

David Perez-Reyna

@davidperezreyna.bsky.social
13 followers 12 following 88 posts
PostsRepliesMedia
David Perez-Reyna @davidperezreyna.bsky.social · 09/08/2026
Para una nueva reforma tributaria, es bueno tener en cuenta que las empresas no pagan impuestos; los pagan las personas. 1/2
100
Reposted by David Perez-Reyna
Lukas Mergele @lukasmergele.bsky.social · 02/02/2026
🌍 Tariffs are making headlines again. Switzerland quietly went the other way – eliminating all industrial tariffs in 2024. Our new study for the Swiss Ministry of Economics shows how consumers benefit. A thread 🧵
3105
David Perez-Reyna @davidperezreyna.bsky.social · 08/03/2026
"tariff elimination benefits consumers."
000
Reposted by David Perez-Reyna
Lucas Calderón @lucascalderon.bsky.social · 07/01/2026
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
media.tenor.com
a poster that says no me quiten la libertad de votar como quiera
ALT: a poster that says no me quiten la libertad de votar como quiera
001
Reposted by David Perez-Reyna
Dana Scott @danascott.bsky.social · 05/11/2025
🚨 JOB MARKET PAPER ALERT! 🚨 Why do firms provide different workplace amenities? And how does amenity provision affect labor market inequality? 🧵
23915
David Perez-Reyna @davidperezreyna.bsky.social · 17/11/2025
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
100
Reposted by David Perez-Reyna
Petter Törnberg @pettertornberg.com · 06/08/2025
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
arxiv.org
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?...
14300105
David Perez-Reyna @davidperezreyna.bsky.social · 02/10/2025
"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
000
David Perez-Reyna @davidperezreyna.bsky.social · 20/08/2025
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
100
David Perez-Reyna @davidperezreyna.bsky.social · 12/08/2025
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
133
David Perez-Reyna @davidperezreyna.bsky.social · 01/08/2025
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
100
David Perez-Reyna @davidperezreyna.bsky.social · 29/07/2025
Se puede bajar el gasto público sin comprometer la provisión de servicios públicos. Nueva entrada en #VocesDeEconomía. Enlace abajo 1/2
100
David Perez-Reyna @davidperezreyna.bsky.social · 21/07/2025
¿esto es ser neoliberal? 1/2
100
David Perez-Reyna @davidperezreyna.bsky.social · 20/07/2025
Colombia, te quiero tanto
000
David Perez-Reyna @davidperezreyna.bsky.social · 19/07/2025
"The irony of labour-saving automation is that people often stand in the way." From @TheEconomist
100
David Perez-Reyna @davidperezreyna.bsky.social · 06/07/2025
Autonomous vehicles should complement public transit, and automating transit should be a goal. Interesting entry by Hayden Clarkin (@the_transit_guy)
100
David Perez-Reyna @davidperezreyna.bsky.social · 12/06/2025
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.
100
David Perez-Reyna @davidperezreyna.bsky.social · 05/06/2025
"Sustained growth, last seen over a decade ago, would provide the sharpest relief." From The Economist
100
David Perez-Reyna @davidperezreyna.bsky.social · 04/06/2025
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)
100
David Perez-Reyna @davidperezreyna.bsky.social · 29/05/2025
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.
100
David Perez-Reyna @davidperezreyna.bsky.social · 29/05/2025
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... 🏦📊
101
David Perez-Reyna @davidperezreyna.bsky.social · 29/05/2025
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
100
David Perez-Reyna @davidperezreyna.bsky.social · 26/05/2025
"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....
000
David Perez-Reyna @davidperezreyna.bsky.social · 23/05/2025
"Voters should pay more attention to those with a good record of taking care of the rubbish bins" www.economist.com/eu...
economist.com
Europe’s mayors are islands of liberalism in a sea of populists
City bosses are the functioning bits of increasingly dysfunctional polities
000
David Perez-Reyna @davidperezreyna.bsky.social · 17/05/2025
#DosisDeOptimismo ourworldindata.org/c...
ourworldindata.org
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.
000
David Perez-Reyna @davidperezreyna.bsky.social · 04/05/2025
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...
sciencedirect.com
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 …
000
Reposted by David Perez-Reyna
guidoimbens.bsky.social @guidoimbens.bsky.social · 27/03/2025
I am excited to see whether this will work. Irrespective of that, I think journals should experiment more with the publication process.
1353
David Perez-Reyna @davidperezreyna.bsky.social · 16/04/2025
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...
economist.com
America’s progressives should love standardised tests
New evidence in a long-running argument
000
David Perez-Reyna @davidperezreyna.bsky.social · 13/04/2025
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...
open.substack.com
Will a recession raise productivity?
Probably not. But, historically, U.S. recessions often have.
010
David Perez-Reyna @davidperezreyna.bsky.social · 13/04/2025
"Slowly but surely, ai is helping turn brown to green." #DosisDeOptimismo www.economist.com/sc...
economist.com
AI models are helping dirty industries go green
Mining companies and steelmakers are feeling the benefits
000
Reposted by David Perez-Reyna
Pau S. Pujolas @paupujolas.bsky.social · 08/12/2024
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.
papers.ssrn.com
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
042
David Perez-Reyna @davidperezreyna.bsky.social · 29/03/2025
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...
open.substack.com
Stop saying a value-added tax is an export subsidy
It's not. No matter how many times people (even economists) say they are.
000
David Perez-Reyna @davidperezreyna.bsky.social · 22/03/2025
# 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...
open.substack.com
Do Lower Legal Interest Rates Actually Reduce Borrowing Costs?
The problem with maximum interest rates is that they increase the marginal cost of borrowing
000
David Perez-Reyna @davidperezreyna.bsky.social · 20/03/2025
"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...
economist.com
If you can’t find a place to rent, blame the government
Foolish crusades against landlords have made housing shortages worse
000
David Perez-Reyna @davidperezreyna.bsky.social · 18/03/2025
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/...
golyfutbol.com
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.
000
David Perez-Reyna @davidperezreyna.bsky.social · 17/03/2025
" 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/...
nber.org
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.
000
David Perez-Reyna @davidperezreyna.bsky.social · 10/03/2025
📊 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...
000
David Perez-Reyna @davidperezreyna.bsky.social · 28/02/2025
Conditional cash transfers can lead to suboptimal decisions. Unconditional cash transfers are a better option, in my opinion. www.economist.com/br...
economist.com
Paying teenagers to go to school was a bad idea
At least in Britain
000
David Perez-Reyna @davidperezreyna.bsky.social · 27/02/2025
"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...
economist.com
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
000
David Perez-Reyna @davidperezreyna.bsky.social · 25/02/2025
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...
elespectador.com
Pintar la fachada
En octubre de 2023, en este mismo espacio, comencé una columna con una premisa.
000
David Perez-Reyna @davidperezreyna.bsky.social · 23/02/2025
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...
010
David Perez-Reyna @davidperezreyna.bsky.social · 14/02/2025
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."
100
David Perez-Reyna @davidperezreyna.bsky.social · 08/02/2025
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...
open.substack.com
Chaos kills coordination
Economic calculation requires more than just monetary stability
000
David Perez-Reyna @davidperezreyna.bsky.social · 04/02/2025
"Family policies can affect family planning through financial incentives"
010
David Perez-Reyna @davidperezreyna.bsky.social · 30/01/2025
"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...
020
David Perez-Reyna @davidperezreyna.bsky.social · 30/01/2025
"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...
economist.com
By cutting off assistance to foreigners, America hurts itself
Donald Trump’s chaotic aid freeze makes his country weaker
000
David Perez-Reyna @davidperezreyna.bsky.social · 28/01/2025
"Has corporate greed driven inflation in the European Union?" Short answer: no www.sciencedirect.co...
sciencedirect.com
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…
000
David Perez-Reyna @davidperezreyna.bsky.social · 25/01/2025
¿Se aplicará a las "ías"?
000
David Perez-Reyna @davidperezreyna.bsky.social · 23/01/2025
“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...
economist.com
Do tariffs raise inflation?
Usually. But the bigger problem is that they harm economic growth and innovation
000
David Perez-Reyna @davidperezreyna.bsky.social · 22/01/2025
¿El mismo mecanismo seguirá funcionando hoy en día? E.g. países que construyen nuevas capitales
000