Category: Education
MRU video on opportunity cost
Please note that this video is part of our free Intro to Economics unit plan.
Twenty Years of Marginal Revolution!
Who would have guessed that after twenty years Tyler and I would still be writing Marginal Revolution! Thanks especially to Tyler, we have had multiple new posts every single day for twenty years! Incredible.
We had some idea when starting Marginal Revolution that it would provide the foundation for our eventual textbook, Modern Principles of Economics, but we didn’t imagine that it would also become the foundation for our online platform for economics education, Marginal Revolution University and Conversations with Tyler, Emergent Ventures and various other projects of Tyler and myself.
We never imagined that Marginal Revolution would one day be archived by the Library of Congress or become one of the world’s nexus points for debating and understanding events like the Financial Crisis and the Covid Pandemic. It was a shock when the first undergrad told us that they had been reading MR since the age of 12. Today, there are multiple PhD economists who grew up reading Marginal Revolution.
In this conversation, with David Perell, we reflect on 20 years and talk about our process of writing and working together. Tyler is very funny. Tyrone makes an appearance or two, albeit never announced. (Apple podcast, Spotify).
We also thank our many readers and the commentators. You all make MR better (ok, most of you make MR better).
We are still excited to write about economics every day and we don’t think we have peaked! Let’s see what happens over the next 20 years. Thank you all.
In which sector are the top performers stupidest?
One of my core views is that the most successful performers in most (not all) areas are extremely smart and talented. So if you are one of the (let’s say) top fifty global performers in an area, you are likely to be one sharp cookie, even if the form of your intelligence is quite different from that in say academia or the tech world.
You might that a sport such as basketball selects for height, and thus its top performers are not all that mentally impressive. But I’ve spent a lot of time consuming the words of Lebron James, Magic Johnson, Michael Jordan, and Kareem Abdul-Jabbar (including a podcast and a dinner with the latter), and I am firmly convinced they are all extremely intelligent. From what I’ve read about supermodels, they are also an extremely intelligent group at the very top. There are many good-looking women, but managing your career to get to the top in a non-self-destructive fashion still requires extreme talent.
In general, most forms of top achievement involve knowing how to practice and knowing how to manage your career, both of which are likely to select for both smarts and determination.
So what then is the area where top performers are just not that smart? Comments are open.
YouTube does not polarize, yet further results in this direction
We find that while the [YouTube] algorithm pulls users away from political extremes, this pull is asymmetric, with users being pulled away from Far Right content stronger than from Far Left. Furthermore, we show that the recommendations made by the algorithm skew left even when the user does not have a watch history.
That is from a new research paper by Hazem Ibrahim, et.al. For further cites showing that YouTube does not polarize, see this CWT. Via Matt Grossman.
Return to the Econ
Joshua Gans revisits life among the econ, 50 years after the classic investigation by Axel Leijonhufvud.
In Leijonhufvud’s time, economics was dominated by two super-castes which worshipped different totems.
Today, however, the super-castes are hardly to be seen and the old totems have been replaced by a singular new totem:
The technology powering the Econ runs on one precious resource, d’ta, and the work of obtaining that d’ta rests with the grads. Upon arrival in the dept, they are immediately sent into the D’ta Mines and tasked with collecting seemingly impossible quantities of the resource. They toil in dirty and unsanitary conditions. Ironically, their next task is to painstakingly clean and polish the d’ta they have extracted one at a time — sometimes millions of individual items — so they can then be sorted and made available for processing. With luck, the grads may be assigned processing tasks that take place in windowless rooms twenty-four hours a day operating a single machine. The hope is that they can then produce the new high achievement of the Econ, a tabl. It is hard to describe what a tabl is to outsiders, but it represents the outcome of finely processed d’ta. The more the tabl contains bright, bejewelling in the form of star-like symbols (*), the more valuable it is. Failure to create a sufficiently dazzled tabl means being sent back to the mines.
Listen to Lech
WashPost: Of the giants who brought down the Iron Curtain — among them Ronald Reagan, Margaret Thatcher, John Paul II, Vaclav Havel — only Walesa is still with us. At 79, he still looks as vigorous as the young electrician who led a workers’ uprising against the “dictatorship of the proletariat”; forced Poland’s Marxist regime to recognize the first independent trade union in the communist world; was imprisoned under martial law only to later force his former jailers at the negotiating table to allow free elections; and who, as the first president of the newly free Poland, anchored his former Warsaw Pact country in the institutions of the West.
Sitting in his office at the European Solidarity Center, the museum built on the grounds of the old Lenin Shipyard where Solidarity was born, I asked about polls showing that half of young Americans have a positive view of socialism. What is his message for young people who have no living memory of communism? “Many young people are actually fooled to accept communism as an idea,” he said, speaking through an interpreter. “There are beautiful sentences talking about equality, about justice. … But as soon as you start putting that system into practice, all sorts of serious disasters come about. But young people quite often don’t know it. We have experience [with socialism], so we really know something about it. So, I strongly recommend rejecting it.”
Emergent Ventures winners, 28th cohort
Anup Malani and Michael Sonnenschein, Chicago and Los Angeles respectively, repeat winners, now collaborating on a new project of interest.
Jesse Lee, Calgary, to lower the costs on developing safe and effective sugar substitutes.
Russel Ismael, Montreal, just finished as an undergraduate, to develop a new mucoadhesive to improve drug delivery outcomes.
Calix Huang, USC, 18 years old, general career development, AI and start-ups,
Aiden Bai, NYC, 18, “to work more on Million.js, an open source React alternative,” and general career development. Twitter here.
Shrey Jain, Toronto, AI and cryptography and privacy.
Jonathan Xu, Toronto, currently Singapore, general career support, also with an interest in AI, fMRI, and mind-reading.
Viha Kedia, Dubai/ starting at U. Penn., writing, general career development.
Krishiv Thakuria, entering sophomore in high school, Ontario, Ed tech and general career development.
Alishba Imran, UC Berkeley/Ontario, to study machine learning and robotics and materials, general career development, and for computing time and a home lab.
Jonathan Dockrell, Dublin, to finance a trip to Próspera to meet with prospective venture capitalists for an air rights project.
Nasiyah Isra-Ul, Chesterfield, VA, to write about, promote, and create a documentary about home schooling.
Sarhaan Gulati, Vancouver, to develop drones for Mars.
And the new Ukrainian cohort:
Viktoriia Shcherba, Kyiv, now entering Harris School, University of Chicago, to study economic and political reconstruction.
Dmytro Semykras, Graz, Austria, to develop his career as a pianist. Here is one recent performance.
Please do note there is some “rationing of cohorts,” so some recent winners are not listed but next time will be. And those working on talent issues will (in due time) end up in their own cohort.
What makes for a good Royal Navy senior officer?
In most studies of talent, it is very difficult to get the top performers to respond or offer data. This paper is a major exception to that general limitation:
This paper assesses the impact of general intelligence, as well as specific personality traits, and aspects of motivation, on performance, potential, and advancement of senior leaders. A questionnaire survey was conducted on the full population of 381 senior officers in the Royal Navy with an 80% response rate. Performance, potential, and rate of advancement were established direct from the organization’s appraisal system; intelligence, personality traits and motivation were assessed, at the time of the study, using the Verify G+ Test, Occupational Personality Questionnaire, and Motivation Questionnaire. Findings suggest differences in motivation are more important than differences in general intelligence, or personality traits, in predicting assessed performance, potential within, and actual rate of advancement to, senior leadership positions. This is a rare example of a study into very senior leaders, validated against both formal appraisal data and actual rates of advancement. As a consequence of this study the Royal Navy has started to use psychometric-based assessments as part of the selection and development of its most Senior Officers.
Here is the full (gated) paper by Mike Young and Victor Dulewicz. I’ll pull out and repeat the key sentence there: “Findings suggest differences in motivation are more important than differences in general intelligence, or personality traits, in predicting assessed performance, potential within, and actual rate of advancement to, senior leadership positions.“
The WV Canary in the Coal Mine
West Virginia University has announced a preliminary plan to cut 7% of its faculty and 9% of its majors:
Among the programs recommended for discontinuance, World Languages including all 32 faculty positions. WVU is also recommending the elimination of several programs in the College of Creative Arts, graduate programs in higher education administration and special education.
On twitter there is a lot of bemoaning about the importance of languages but the students are voting with their feet. Indeed, most of these programs are only sustained by foreign language requirements which are increasingly otiose in a world with ubiquitous instant translation. The students are correct, the value of learning a second language has fallen.
Where the ax should fall may be debatable but the ax must fall somewhere because of demographics. College enrollment peaked in 2010 and has since fallen by 15%. What’s going on in WV is thus a reflection of national trends, magnified by West Virginia’s own decline in population. Full paying foreign students from China are also way down. Now add to declining college demographics, budgets hit by the great recession and then the pandemic. Now add in the rise of online learning which means that universities can outsource low-demand classes to other universities and save money and quite likely increase quality. (Indeed, the local teacher might have been teaching online anyway so why not substitute with a world expert and great teacher who has the backing of an entire team of delivery experts?) Finally, add in the fact that a substantial part of the electorate would like to see a decline in programs they see as politicized.
Put it all together and the only surprise is how long it has taken for the ax to fall. You can be sure, however, that there is more chopping to be done.
Public school choice programs in Los Angeles
Does a school district that expands school choice provide better outcomes for students than a neighborhood-based assignment system? This paper studies the Zones of Choice (ZOC) program, a school choice initiative of the Los Angeles Unified School District (LAUSD) that created small high school markets in some neighborhoods but left attendance-zone boundaries in place throughout the rest of the district. We study market-level impacts of choice on student achievement and college enrollment using a differences-in-differences design. Student outcomes in ZOC markets increased markedly, narrowing achievement and college enrollment gaps between ZOC neighborhoods and the rest of the district. The effects of ZOC are larger for schools exposed to more competition, supporting the notion that competition is a key channel. Demand estimates suggest families place substantial weight on schools’ academic quality, providing schools with competition-induced incentives to improve their effectiveness. The evidence demonstrates that public school choice programs have the potential to improve school quality and reduce neighborhood-based disparities in educational opportunity.
That is from a new NBER working paper by Christopher Campos and Caitlin Kearns. Oh how underrated school choice programs were five to ten years ago!
My very excellent Conversation with Paul Graham
Here is the audio and transcript, here is the episode summary:
Tyler and Y Combinator co-founder Paul Graham sat down at his home in the English countryside to discuss what areas of talent judgment his co-founder and wife Jessica Livingston is better at, whether young founders have gotten rarer, whether he still takes a dim view of solo founders, how to 2x ambition in the developed world, on the minute past which a Y Combinator interviewer is unlikely to change their mind, what YC learned after rejecting companies, how he got over his fear of flying, Florentine history, why almost all good artists are underrated, what’s gone wrong in art, why new homes and neighborhoods are ugly, why he wants to visit the Dark Ages, why he’s optimistic about Britain and San Fransisco, the challenges of regulating AI, whether we’re underinvesting in high-cost interruption activities, walking, soundproofing, fame, and more.
Of course mostly we talked about talent selection, here is one bit:
COWEN: If you think that something has gone wrong in the history of art, and you tried to explain that in as few dimensions as possible, what’s your account of what went wrong?
GRAHAM: Oh, I can explain this very briefly. Brand and craft became divorced. It used to be that the best artists were the best craftspeople. Once art started to be reproduced in newspapers and magazines and things like that, you could create a brand that wasn’t based on quality.
COWEN: So, you think it’s mass media causing the divorce between brand and craft?
GRAHAM: It certainly helps.
COWEN: Then talent’s responding accordingly. Fundamentally, what went wrong?
GRAHAM: You invent some shtick, right?
COWEN: Right.
GRAHAM: And then — technically, it’s called a signature style — you paint with this special shtick. If someone can get some ball rolling, some speculative ball rolling, which dealers specialize in, then someone buys the painting with your shtick and hangs it on the wall in their loft in Tribeca. And people come in and say, “Oh, my goodness, that’s a so and so,” which they recognize because they’ve seen this shtick. [laughs]
COWEN: Say, if we have modernism raging in the 1920s, and the ’20s mass media is radio for the most part —
GRAHAM: No, no, no, newspapers were huge. Modernism was well —
COWEN: But not for showing paintings, right? There’s no color in the papers. You had to be —
And here is one exchange on talent:
COWEN: Why is there not more ambition in the developed world? Say we wanted to boost ambition by 2X. What’s the actual constraint? What stands in the way?
GRAHAM: Boy, what a fabulous question. I wish you’d asked me that an hour ago, so I could have had some time to think about it between now and then.
COWEN: [laughs] You’re clearly good at boosting ambition, so you’re pulling on some lever, right? What is it you do?
GRAHAM: Oh, okay. How do I do it? People are, for various reasons — for multiple reasons — they’re afraid to think really big. There are multiple reasons. One, it seems overreaching. Two, it seems like it would be an awful lot of work. [laughs]
As an outside person, I’m like an instructor in some fitness class. I can tell someone who’s already working as hard as they can, “All right, push harder.”
[laughter]
It doesn’t cost me any effort. Surprisingly often, as in the fitness class, they are capable of pushing harder. A lot of my secret is just being the person who doesn’t have to actually do the work that I’m suggesting they do.
COWEN: How much of what you do is reshuffling their networks? There are people with potential. They’re in semi-average networks —
GRAHAM: Wait. That was such an interesting question. We should talk about that some more because that really is an interesting question. Imagine how amazing it would be if all the ambitious people can be more ambitious. That really is an interesting question. There’s got to be more to it than just the fact that I don’t have to do the work.
COWEN: I think a lot of it is reshuffling networks. You need someone who can identify who should be in a better network. You boost the total size of all networking that goes on, and you make sure those people with potential —
GRAHAM: By reshuffling networks, you mean introducing people to one another?
COWEN: Of course.
GRAHAM: Yes.
COWEN: You pull them away from their old peers, who are not good enough for them, and you bring them into new circles, which will raise their sights.
GRAHAM: Eh, maybe. That is true. When you read autobiographies, there’s often an effect when people go to some elite university after growing up in the middle of the countryside somewhere. They suddenly become more excited because there’s a critical mass of like-minded people around. But I don’t think that’s the main thing. I mean, that is a big thing.
Definitely recommended.
Video quiz on the supply curve
The Disparate Impacts of College Admissions Policies on Asian American Applicants
Dept. of Yikes, but at this point who is surprised?:
…we estimate the odds that Asian American applicants were admitted to at least one of the schools we consider were 28% lower than the odds for white students with similar test scores, grade-point averages, and extracurricular activities. The gap was particularly pronounced for students of South Asian descent (49% lower odds). We trace this pattern in part to two factors. First, many selective colleges openly give preference to the children of alumni, and we find that white applicants were substantially more likely to have such legacy status than Asian applicants, especially South Asian applicants. Second, after adjusting for observed student characteristics, the institutions we consider appear less likely to admit students from geographic regions with relatively high shares of applicants who are Asian.
That is from a new NBER working paper by Joshua Grossman, Sabina Tomkins, Lindsay C. Page, and Sharad Goel.
Sort of Middlebury markets in everything
Middlebury lacks sufficient housing for all the students planning to attend this fall. After exhausting other options, the college plans to pay 30 students $10,000 each to stay away.
Clever idea, but I’m sure you all noticed the “After exhausting other options” clause in there. Here is from the rest of the story:
But the nonresidential buildings could not be renovated in time to add necessary safety features, and the college decided not to house students at Bread Loaf due to the logistics of running a satellite operation, as well as negative feedback from students who had lived there earlier in the pandemic and said they’d felt isolated from the main campus.
I say Granny Flats and beans! It is not for long, so let the learning continue. The article does not discuss the stance of the town of Middlebury, but as it is an exclusive village of about 9,000 I can take a wild guess…
Clean Hands, Clear Conclusions: Ignaz Semmelweis as a Pioneer of Causal Inference
My next series is a few things at once. It’s a reminder that sometimes people will do everything in their power to present evidence supporting scientific facts, be unpersuasive and be sent to a mental hospital by their best friend where they spend the next two weeks being beaten by guards mercilessly and then die. But it’s also a discussion of difference-in-differences, and perhaps the challenges of estimation if you’re not entirely clear what the treatment is. And the last thing is just a puzzle I wanted to share in the context of trying to make a broader point about precisely what is implied by the identification elements of a traditional difference-in-differences design.
An excellent introduction to Ignaz Semmelweis, a pioneer in causal inference and medicine, by Scott Cunningham.