Helpful Teaching Resources

In this brief post, I want to commend a few teaching resources that have been helpful over the past few months of teaching.

For teaching students the nuts and bolts of causal inference, the new Mastering Metrics videos with Josh Angrist on Marginal Revolution University are terrific. The causal animations from Nick Huntington-Klein (and other resources) are also very helpful. This app on linear regression from Luke M. Froeb and Keyuan Jiang is a helpful way to help students gain econometric intuition. They have a companion paper to the app on SSRN.

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Vegetarian Culpability Part 2 (Economics of Information Edition)

Previously, I wrote about the paralysis that a vegetarian would face if confronted with a broad view of production inputs. Namely, that hunting Cecil the lion was part of the dentist’s maintenance of his own labor. Given that preferences are diverse, we’re all perpetually facing a similar dilemma: If we trade with someone, then we are definitely, 100% helping them to do immoral things with which we disagree.

After a good night’s rest, I awoke and realized an age-old tool that humans have used to address the issue. As humans, we care and know most about those people who are closest to us. My previous analysis took as given that all of the relevant information concerning our trade partners was available. However, as Stigler knew well, information is a good and it’s costly to obtain.

When you know that your local lawyer is also a drug-dealer and a lecher, you don’t employ his services. Of course, your moral taste dictates a boycott as appropriate because his actions would be aided by your cooperative trade. The information about his divergent moral preferences is cheap and easy to obtain.

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Coase and COVID

Update: I added a comment on the post to clarify why I don’t think that having seniors stay at home is the correct Coasean solution. In short: social isolation has high costs!

Bryan Caplan has an interesting post on COVID and reciprocal externalities. Caplan starts off with the straightforward Coasean statement: “Yes, people who don’t wear masks impose negative externalities on others. But people who insist on masks impose negative externalities, too.”

For those not familiar with Coase’s 1960 article, one of his fundamental insights about property rights is that when property rights are not clearly defined, both parties can be imposing costs on one another. The externalities are reciprocal, not just in one direction. The efficient outcome, when bargaining is not possible, is to allocate the property right such that the “least cost avoider” is the one that adjusts their behavior. In other words, you allocate the property right to the party who would obtain the property right if bargaining were possible.

But Caplan uses this Coasean framework to come to the opposite conclusion that I would. Why?

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Reddit GameStop Stock Bubble Deflates; Roaring Kitty Speaks; Hearings Loom

Last week we noted how a hive of millions of small, mainly young investors in the Reddit user group, r/wallstreetbets (“WSB”) targeted GME, the small, heavily shorted stock of troubled video game retailer GameStop. In a classic short squeeze, the stock price was driven up from a more or less rational price of $20 per share, to over $400.

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The Matriculant Theory of Value

The Labor Theory of Value goes like this: the value of a good, and the price it should command in the market, will (should) reflect the amount of labor it takes to produce it. It’s a classic fallacy, but not one we should mock. Yes, Marxist thought still often cling to it as it chases its own Hegelian dragon, but Adam Smith and David Ricardo both struggled with understanding why something that yields so little predictive value could still feel so right.

Which brings me to the updated credentialist version of this fallacy:

Now, I apologize for picking on this person, and this tweet, in particular. Similar gripes appear appear regularly in social media and The Chronicle of Higher Education on a regular basis. The formula runs as such: I, and people such of myself, have spent many years in school, have successfully been credentialed with a BA/MA/MFA/PhD, but the labor market refuses to reward us appropriately.

To be clear, I understand the deeply intuitive appeal of the Labor Theory of Value– the more labor I put into making something, the more people should pay me for the product of my labor. The problem with this logic is the very core of the economic puzzle: goods are only worth what people are willing to exchange for them. If you spend a year molding rotting eggshells into a 25-foot statue of Mickey Mouse, it might earn you something at an art auction, but probably not as much as you would have earned working an equivalent number of hours at Taco Bell. At the same time, you could take an art class at a local community college, paint a soft focus acrylic of the local high school, and sell it to an alum for $100. Or you could find a dinosaur egg in your backyard the day after you bought the house and sell it for $2000. Which is the more compelling artistic statement or mantle centerpiece is debatable, but the price each commands in the market is entirely objective, and has nothing to do with the hours of labor that went into them.

Which me brings to me the Matriculant Theory of Value: the more labor and tuition money I put towards producing a more credentialed version of myself, the more people should pay for the product of my labor. I’m sorry to report that the market doesn’t care about your degrees, it cares about what you can produce and the value the market places on that product. If you didn’t acquire any skills valued by the labor market, then your degree is only worth however much the firm values any marginal prestige it might enjoy from your credentials or the interesting conversation you may offer in the break room. If I’m an academic drawing a salary from an institution of higher education (and I am), then I’m reading not as a sign that I should be angry we’re not getting paid enough, but as a sign that I should be terrified that employers don’t value educational product I am currently producing.

Now, unlike a lot of scolds, I am sympathetic to the academic misinformation that students often find themselves marinating in. Professors enjoy telling students who might be wary of joining the glut of PhDs applying for scarce academic jobs, “Don’t worry, you’ll get a job. You’re special and brilliant and you deserve a job.” Given that these professors need cheap labor, but often lack resources, they are all to happy to pay “in trade” i.e. with an advanced degree. For that deal to work though, you have to convince students that the degree has value. They are all too quick to valorize a “life of the mind” not unlike acolytes being invited to take a vow of poverty, and with more than a little implied denigration of more proletarian endeavors.

We also have a tendency to grossly overemphasize grades, academic status, and completion. Rarely do I see a student told that it might be better to get a C in a challenging technical class than dodge it for the sake of their GPA. Who is going to be better valued in the market: a 3.9 GPA student who glided on fluff for four years, or a student who took 5 challenging technical courses over 4 years, failing 2 of them, and collapses at the finish line with a 2.1 GPA and hard earned BS?

What I am less sympathetic to is the frequent failure to admit the other allures of degrees less valued by the market: they’re fun. For a certain type of person, there is pleasure bordering on euphoric to sitting in a comfortable chair and reading histories, grand theories, and poetics for 8 hours a day. If you love your job, you don’t have to work a day in your life. True, but that doesn’t mean anyone has to pay you for it. It should worry you if your anticipated vocation is what other people do on their vacation. Not that it doesn’t have social value (it may have significant social value), but you should be terrified of trying to make a career doing what someone else is willing to do for free. You’ll not be surprised to learn no one is paying me to write these rambling diatribes.

So, yes, $38k a year for 9 months of work giving 10 hours of lectures a week, plus prep, grading, and office hours maybe doesn’t seem like much in the way of wages to you. I was paid $34k (2003 dollars) for 10 months a year teaching 19 hours of lectures a week, plus prep, grading, and parent meetings when I was a high school teacher, so I guess I could make a snarky case that the professor in question is being overpaid, especially since I hold to the belief that public K-12 teachers are underpaid relative to the social value they produce, but that is another post. But I also have enough awareness to know not to complain too much about how an indoor job with no heavy lifting is underpaid, particularly if we are resorting to any version of the labor theory of value. I dare you to walk into any professional kitchen and tell them these exact contract details, the nature of your work, and then explain to them that you’re the one who deserves to be paid more.

One last gripe. If you are sufficiently talented, conscientious, and privileged to complete a PhD, but your field of study offers you no option better than $38k/year to teach, my guess is that you’ve been not just unlucky, but proactively diligent in dodging every bit of coursework that could lead to a higher wage in the market. And I don’t just mean all of that unpleasant math you hate. Or statistics. Or java/C++/Python/etc. I mean even the adjacent courses of study or research projects where the skill acquisition path is that much more taxing or unpleasant. You didn’t study computational anthropology or physical anthropology or field anthropology. You studied cultural anthropology, fine…but you were also careful to avoid data at every step, opting instead you to memorize soft theory jargon and write the kind of dissertation that tells everyone exactly how smart you are, but not much else. Make no mistake, if you spend 5-8 years getting a PhD you may have gotten bad advice, you may have suffered the fallacy of sunk costs, you may have been done a gratuitous disservice by the faculty guiding your education, and may have been deluded by the matriculant theory of value, but on the bright side you chose a safe and comfortable line of work.

And make no mistake, you did choose it.

Andrew Weaver is Searching for the Skills Gap

Andrew Weaver is doing interesting work on “the skills gap.” One of his key methods is to create new data by interviewing firms. As someone who has looked hard for good data on the skills gap, I can say that we need more work like his.

Weaver’s 2017 paper with Paul Osterman is about data for U.S. manufacturing firms. These findings may or may not generalize perfectly outside of manufacturing, but I think this was a great place to start. There is plenty of talk about the decline of U.S. manufacturing and at least some of the talk was about a lack of skilled Americans to meet the great demand for high-tech doings. For this survey, they only ask about “core workers” who are doing the specialized roles of making widgets.  

Here are two important empirical questions:  a.) do American manufacturing firms want high-skill workers? b.) do they have trouble finding them? The authors answer, “not as much as you might think from policy discussions.”

There are lots of details in the paper that I don’t have time to cover. In table 2, they go over the determinants of a firm facing long-term vacancies. What is common among the (minority of) firms that report having long-term vacancies? Advanced computer proficiency is not associated with difficulty of filling jobs. The implication is that most manufacturing companies around 2017 were able to find workers who had the computer-related skills needed to do the core production tasks. What seemed to be a limiting factor was not computer skills but advanced reading skills. Half of the establishments surveyed said that they require workers with extended reading skills. That could mean, for example, reading a 10-page technical article in a trade journal.

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Will GameStop be as profitable as “Roaring Kitty” predicted in 2019?

He’s been found and he’s talking to the press. He’s known as “Roaring Kitty” on Youtube, and his Reddit username is… something else. The WSJ even talked to his mom which tells you just how much public attention was directed at the event this week that he might be the prime mover of.

The man who convinced a Reddit “army” to drive up the price of Gamestop ($GME) says that he originally simply saw it as a value investment. He believed people would keep shopping there, even though some short sellers on Wall Street bet money on the store going the way of Borders (the way of all flesh).

One of the strange turns of this story is that now people are buying the stock as a means of self-expression. Some of them claim they don’t care if they lose the money they put in. A friend of mine described the scene thusly on his social media account:

#SaveAMC #gamestop Amid the global turmoil, some big banks made billions ‘shorting’ floundering businesses, profiting off of the struggles of failing businesses. Recently those targets were brick and mortar retailers like GameStop and AMC. But the banks got too greedy and shorted too far, so individual investors rallied to invest in these businesses to simultaneously save their favorites and stick it to the banks. Power to the people.

He describes GameStop as a “failing business” and simultaneously declares it a favorite of consumers.

The $GME episode might have been as fun as playing a video game. Will anyone think it’s exciting to shop at GameStop 2 years from now?

If the short sellers were right, then who is helped by prolonging the agony? If the short sellers were wrong, then they will pay anyway.

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Sex Ratios and the Marriage Market: WW1

Last week I wrote about the “marriage market“. In many ways, the marriage market is like a labor market: there are search costs, match quality, competition for mates, and so on. When one side of the market becomes more abundant, that side become less picky — their minimum willingness to accept goes down.

Today we examine war as a shock that makes women more abundant than men. The marriage market predicts this shock will mean a smaller fraction of women will marry but those that do receive a smaller share of the benefits from marriage. Also, a larger fraction of men will marry and receive a larger share of the benefits from marriage.

Ran Abramitzky, Adeline Delavande, and Luis Vasconcelos investigate marriage in pre-and-post World War 1 (WW1) France where an estimated 16.5 percent of the French male population died or were missing in WW1. You can see from the map below that some “departments” suffered greater losses than others. Across France, the sex ratio was nearly even before the war and after the war, “If we focus on singles, widows, and divorces who were 30 years old or younger but of marriageable age, there were approximately 2 men for every 3 women.”

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The GameStop Short Squeeze: Swarm of Small Investors Stings Wall Street Hedge Funds

If you think the price of a stock is going to go up, you can buy shares and wait for the price to go up, then sell the shares to someone else. This is called being “long” a stock. If it turns out that the stock price goes down and stays down, the most money you can lose is the amount you put in, since the stock price cannot go below zero.

But what if you think the stock price is going to go down instead of up? You may believe the price has run up irrationally high, or your analysis uncovers poor earnings prospects. A favorite tactic of Wall Street pros, including hedge funds, in this case is to “short” a stock.

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Vegetarian Culpability

Do you remember that dentist who went to Africa and shot Cecil the lion? I had a vegan friend who said that she would boycott him – had he been her dentist.

I can’t tell you how many questions I had. Why boycott him? In a competitive market, it would have no long-run impact on his economic profits. Was it important that his murder of Cecil was part of his consumption/leisure behavior rather than part of his provision of dental services? Does trading with people who have different preferences make one morally culpable for their consequently afforded activities?

A Trip Down Reasoning Lane

Let’s take some things as given. 

  • My friend is vegan and didn’t want Cecil to be on the receiving end of homicide (leon-icide?). 
  • Big-game hunting was a consumption activity for, who I’ll call, the dentist.
  • Everyone has unique preferences – including moral tastes.
  • Voluntary trade makes both parties better off.
  • There are a variety of input combinations that a firm can adopt in order to create output.
  • Humans are responsible for their own behavior to varying degrees.

My understanding of my friend’s would-be boycott is that lion-hunting was a direct result of the dentist’s inappropriate preferences and economic empowerment. Therefore, boycotting the dentist would reduce the dentist’s budget, and consequently reduce his spending on improper activities. Knowing that the dentist would spend his income in this manner makes each transaction with him a contribution to satisfying his illicit preferences.

Mo’ Money Mo’ Problems

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