Jon Hartley Profile picture
Jul 12 18 tweets 8 min read Read on X
The Democratic Socialists of America (DSA) is the largest socialist organization in the United States today, and its influence is on the rise in Democratic Party (dangerously in my opinion). But what is its history? A thread on the recent rise of socialism in America 🧵 Image
2/ Michael Harrington was a leading early voice of democratic socialism. Raised in an Irish Catholic family, Harrington attended Jesuit schools & was active in Catholic social circles before leaving the faith. His 1962 book "The Other America" documented persistent poverty in the U.S. & inspired LBJ's War on Poverty.Image
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3/ Harrington rejected both Soviet communism and revolutionary Marxism. He argued socialism could be democratic, with free elections, civil liberties, constitutional government, and a free press. Image
4/ DSA's roots run through the Socialist Party of America. During the late 1960s and early 1970s, disputes over the Vietnam War, the Democratic Party, and foreign policy fractured the party into competing factions. Image
5/ In 1973, Harrington founded the Democratic Socialist Organizing Committee (DSOC). Rather than build a third party, DSOC sought to move the Democratic Party in a more social democratic direction. Image
6/ Another important group was the New American Movement (NAM), founded in 1971. It emerged from the New Left and emphasized feminism, civil rights, grassroots organizing, and participatory democracy. Image
7/ In 1982, DSOC and NAM merged to create the Democratic Socialists of America (DSA). Harrington became its first honorary chair and remained its best-known public intellectual until his death in 1989. Image
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8/ For decades, DSA remained relatively small, with only a few thousand members. It focused on labor unions, healthcare, housing, and influencing Democratic Party politics rather than running many candidates of its own.
9/ Everything changed after Bernie Sanders' 2016 presidential campaign. Although Sanders has never been a DSA member, his campaign made "democratic socialist" a mainstream political label and fueled explosive membership growth. Image
10/ DSA grew from roughly 6,000 members before 2016 to more than 90,000 at its peak in the early 2020s, becoming the largest socialist organization in the U.S. in decades. Image
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11/ DSA has endorsed candidates including Alexandria Ocasio-Cortez, Rashida Tlaib, Cori Bush, Jamaal Bowman, Zohran Mamdani, and hundreds of state and local candidates. Image
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12/ From a conservative perspective, DSA's vision represents a sharp break from the American constitutional tradition of limited government & private enterprise. It instead places much greater faith in government economic management, redistribution & public ownership. Image
13/ DSA argues that many sectors of the economy should be removed from market competition and brought under greater public control. Its platform has included proposals such as Medicare for All, social housing, stronger labor protections, public ownership in some industries, & much higher taxes including in the form of wealth taxes and greater income taxation on top earners.Image
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14/ Time and again many of these ideas have repeatedly produced slower growth, weaker incentives to innovate and invest, larger bureaucracies, & diminished economic freedom. History offers many examples where expanding state control ultimately reduced prosperity and reversing it restored economic growth papers.ssrn.com/sol3/papers.cf…
15/ Folks often fail to distinguish between market economies with generous welfare states (Eg. Denmark, Sweden, Norway, & Finland) & socialism. The Nordics all rely on private property, competitive markets, & have some of the most flexible labor markets among advanced economies Image
16/ Denmark Prime Minister Lars Løkke Rasmussen once said: "I know that some people in the U.S. associate the Nordic model with some sort of socialism. Therefore, I would like to make one thing clear. Denmark is far from a socialist planned economy. Denmark is a market economy" Image
17/ The ultimate criticism of socialism is that it concentrates power in government. Larger government become less accountable even when pursued democratically. It's why Milton Friedman argued why citizens couldn't have any shot of political freedom without economic freedom Image
18/ The debate over DSA ultimately reflects a much older question: Should prosperity be pursued primarily through markets and private initiative, how much redistribution and regulation should there be? That debate has shaped American politics for over a century (with economic freedom advocates gaining increasing ground), and it is a debate unlikely to disappear anytime soon even as socialism advocates return advocating for more radical government policies within the Democratic PartyImage
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More from @Jon_Hartley_

Mar 15
1/Chris Sims is easily one of the most influential macroeconomists (& perhaps most influential empirical macroeconomist) of the last 50 years; he fundamentally changed thinking about monetary policy, metrics,& causality (VARs, time series models). Thread on his greatest hits🧵👇 Image
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2/ "Macroeconomics and Reality" (Econometrica, 1980), introduced VARs to macroeconomics. Sims argued the identifying assumptions in large Keynesian macro models were "incredible". Argued macroeconomists should use VARs (vector autoregressions) as a more honest alternative. Completely changed the direction of empirical macroeconomics.Image
3/ The key insight of (reduced-form) VARs: instead of imposing heavy theoretical structure on the data (as structural models do), let the data speak. Estimate all the relationships together, trace shocks through the system with impulse response functions. This is now standard toolkit in every central bank in the world (& usually more accurate than structural models).Image
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Read 13 tweets
Aug 27, 2025
In honor of the upcoming Celebration in Honor of Thomas Sowell happening this October at the Hoover Institution (@HooverInst), here is a chronological list of all 47 of Sowell's books with an accompanying summary for each along with an image of the book's cover. A thread🧵 Image
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1: Say’s Law: An Historical Analysis (1972)
Sowell’s first major work — a scholarly history of Say’s Law (the idea that "supply creates its own demand") and its critics, tracing debates from the classical economists to Keynes.Image
2: Black Education: Myths and Tragedies (1972)
Critiques misguided education policies for Black students, arguing that well-intentioned reforms often hurt achievement.Image
Read 48 tweets
Jul 9, 2025
🚨The big upward trend in Generative AI/LLM tool use in 2025 continues but may be slowing. An update to our paper "The Labor Market Effects of Generative AI" tracking LLM adoption w surveys (finding LLM use at work went from 30.1% [December 2024] to 45.6% [June 2025]). Thread🧵 Image
Google search data from Google Trends suggests that searches for "ChatGPT" both in the US and Worldwide have roughly doubled in 2025. Image
In April 2025, Sam Altman (@sama) said the number of ChatGPT active users has doubled in just weeks and had reached 1 billion users, up from 400mn in February 20025. It could now be well above 1 billion forbes.com/sites/martinep…
Read 4 tweets
Jun 22, 2025
A thread 🧵 list of the most successful undergraduate theses/student papers of all time:
1. Fred Smith (Yale University, 1966). Proposal for an integrated air–ground delivery system. Became FedEx, a global logistics company.
2. Wendy Kopp (Princeton University, 1989) "An Argument and Plan for the Creation of the Teachers Corps". Founded Teach For America, placing thousands in public schools. Image
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3. John F. Kennedy (Harvard University, 1940), "Why England Slept", became bestselling book; helped launch JFK’s career eventually ending at WH; discusses British government's failure and initial hesitance to take steps to respond to Adolf Hitler's threats of war ahead of WW2. Image
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Read 10 tweets
Jun 10, 2025
"The Elastic Markets Hypothesis" new paper w Felix Gerding. Using country index additions/subtractions, we find multipliers (of flows on stock market prices) are not as high or permanent as recent lit. Stock market demand may be inelastic in short-run but is elastic in long-run🧵 Image
Full "Elastic Markets Hypothesis" Paper is here: papers.ssrn.com/sol3/papers.cf…
The literature demand curves for stocks really begins with Shleifer's famous "Do Demand Curves for Stocks Slope Down?" which uses index reconstitution (note for micro elasticities)
jstor.org/stable/2328486… Image
Much of our paper has been written in response to recent literature starting w/ Gabaix and Koijen (2021) ("Inelastic Markets Hypothesis") who argue that multipliers are as high as 5 & are permanently high. To be clear these are macro not micro mutlipliers nber.org/papers/w28967
Read 10 tweets
May 20, 2025
🚨There has been a massive surge in Generative AI/LLM tool use in 2025. An update to our paper "The Labor Market Effects of Generative AI" tracking LLM adoption using surveys (finding LLM use at work has increased ~30% to ~40% in 2025). Thread🧵along w other evidence of the surge Image
Our U.S. survey evidence has found significant increases in Gemini and ChatGPT use during this period of time. ChatGPT and Gemini remain the most widely used tools. Image
Google search data from Google Trends suggests that searches for "ChatGPT" both in the US and Worldwide have roughly doubled in 2025. Image
Read 10 tweets

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