Can you manage what you can’t measure?

Disclaimer: I’m not a macroeconomist, but I play one in Principles classes. Feel free to point out my errors in the comments.

Economics is filled with imperfect measures of important concepts. GDP, unemployment rates, and price indices all have significant flaws. Measures of entrepreneurship are even worse.

The Chicago Booth IGM Experts’ Panel recently posted an interesting result about the problems with unemployment:


The question is: “The concept of “maximum sustainable employment” is well defined enough to be used beneficially in economic policymaking.”

That’s 42 economists asked, 34 with an opinion (including “uncertain”), and about half of the sentiment is positive. And that sounds about right to me. I read this question as “can we engage in macroeconomic policy that doesn’t do long-run harm?” And if I were to describe my opinion probabilistic, it would look like these results. We could probably do “good policy” with a low degree of precision (i.e. useful enough for severe situations) if 1) we magically didn’t have to deal with political squabbling and 2) explicitly limited our goals to the short run.

Respondents agreeing emphasize that it’s “good enough.” But what does that mean? What level of precision and control are we looking at here?

Here’s the basic situation: given the underlying economic reality (everyone’s individual preferences, capabilities, knowledge, etc.) it makes sense to have some limited number of unemployed people at any given time. Unemployment rate is a measure of “how far are we from 0,” not, “how far are we from the ideal level?” That raises the following questions:

  • How accurately can we know what’s going on in the world?
  • How accurately can we know what’s supposed to be going on in the world?
  • How precisely can we affect the world?

The aggregate macroeconomic theory and empirics of the 1960’s were seriously imprecise. Trying to target macroeconomic policy would be like doing eye surgery with a hand grenade. In that sort of world, your best medicine is probably chicken soup and bed rest.

Here in the present we have much better data and computation. And it’s going to get better. Facebook already has data precise enough to track the exact effects of policy down to the individual level.

But think about a precise outcome and imagine what sort of policy would be required to get there. Let’s say our outcome is “get Rick to buy a new car.” Some mix of low interest rates, the right set of subsidies, and ideal circumstances might move things in that direction. But that sort of surgical outcome is just never going to be possible through legitimate macroeconomic policy (and definitely not monetary policy*). The size of the problem just means that Butterfly Effect problems will prevent macroeconomic policy from having household-level precision, even if the data could (in principle) measure the effect.

Less precise outcomes seem plausible (e.g. “get middle class households in the north east to buy 30-60,000 new cars”), but not without making a lot of second order problems. It’s not so much a “middle of the road leads to socialism” situation as a multiplier effect from a convergent series. Push a billion over there, create big distortions, follow those up with medium distortions, and finally let small remaining problems fizzle out on their own. Throw in public choice issues and it seems obvious that the efficiency cost of precise interventions won’t scale up nicely.

We’re now in a world where our theoretical and empirical tools are more precise than our implementation tools. We’re no longer trying to do surgery with a hand grenade. But that doesn’t mean we’ve got a laser scalpel either. It’s more like we’ve got we’ve got laser-like measuring tools but our implementation tools are blunt objects. If we aren’t careful, we’ll spend our time swatting flies with sledge hammers.

All told, it seems possible that we could engage in fairly targeted macroeconomic policy. But as the scale increases, the marginal cost will rise rapidly (maybe less so with the right institutions). Better timing might increase the effectiveness of each dollar spent*, but overall, it seems like things have to be really bad before the government should consider anything too ambitious.

Manage an economy’s economic health using imperfect measures like unemployment rate is about like trying to manage your physical health using heart rate and body mass index figures. Can we do “good enough”? Only to a limited extent. We could stop eating garbage and get some exercise. But there isn’t some magic combination of vitamins and crystals that will stop cancer. Anyone who tells you otherwise is a) trying to sell you something and b) trying to convince themselves they’re in control of the uncontrollable.

In terms of macroeconomic policy, we should start by caring about fundamentals (i.e. long run economic development) and be skeptical of people promising to control the business cycle.

*And let’s face it, we aren’t likely to get decent macroeconomic policy (in terms of efficiency, timing, and appropriateness of policy to circumstances) out of Congress until there’s a serious cultural shift.


The Dictator’s Handbook

I recently pointed you towards a book that has turned out to be a compelling and interesting read.

At the end of the day, it’s a straightforward application of public choice theory and evolutionary thinking to questions of power. Easy to understand theory is bundled with data and anecdotes* to elucidate the incentives facing dictators, democrats, executives, and public administrators. The differences between them are not discrete: they all face the same basic problem of compelling others’ behavior while facing some threat of replacement.

Nobody rules alone, so staying in power means keeping the right people happy and/or afraid. All leaders are constrained by their underlings. These underlings are necessary to get anything done, but they’re also potential rivals. For Bueno de Mesquita and Smith the crucial facts of a political order are a) how big a coalition (how many underlings) the ruler is beholden too and b) how replaceable the members of that coalition are.

The difference between liberal and illiberal orders boil down to differences in those two parameters. In democracies with a larger coalition and less replaceable coalition members, rulers behave better.


I got a Calculus of Consent flavor from Dictator’s Handbook. At the end of the day, collective decision making will reflect some version of “the will of the people… who matter.” But when we ask about the number of people who matter, we run into C of C thinking. Calling for bigger coalitions is another way of calling for an approach to an effective unanimity rule (at least at the constitutional stage).

In C of C the question of the optimal voting rule (majority vs. super majority vs. unanimity) boils down to a tradeoff between the costs of organizing and the costs of externalities imposed by the ruling coalition. On the graph below (from C of C) we’re comparing organization costs (J) against externality costs (I) (the net costs of the winning coalition’s inefficient policies). The idea is that a unanimity rule would prevent tyranny of the majority (i.e. I is downward sloping), but that doesn’t mean unanimity is the optimal voting rule.

Figure 18.  Click to open in new window.

But instead of asking “what’s efficient” let’s think think about what we can afford out of society’s production, then ask who makes what decisions. In a loose sense, we can think of a horizontal line on the graph above representing our level of wealth. If we** aren’t wealthy enough to organize, then the elites rule and maximize rent extraction. We can’t get far up J, so whichever coalition is able to rule imposes external costs at a high level on I.

But I‘s height is a function of rent extraction. Rulers face the classic conundrum of whether to take a smaller piece of a larger pie.

The book confirms what we already know: when one group can make decisions about what other groups can or must do, expect a negative sum game. But by throwing in evolutionary thinking it shed light on why we see neither an inexorable march of progress nor universal tyranny and misery.

As you travel back in time, people (on average) tend to look more ignorant, cruel, and superstitious. The “default state” of humanity is poverty and ignorance. The key to understanding economics is realizing that we’ve bootstrapped ourselves out of that position and we aren’t done yet.

The Dictator’s Handbook helped me realize that I’d been forgetting that the “default state” of political power is rule by force. The liberalization we’ve seen over the last 500 years has been just the first part of a bootstrapping process.

Understanding the starting point makes it clear that more inclusive systems use ideas, institutions, capital, and technology to abstract upward to more complex levels. Something like martial honor scales up the exercise of power from the tribe (who can The Chief beat up) to the fiefdom (now the Chief has sub-chiefs). Ideology and identity can tie fiefdoms into nation-states (now we’ve got a king and nobility). Wealth plus new ideologies create more inclusive and democratic political orders (now we’ve got a president and political parties). But each stage is built on the foundation set before. We stand on the shoulders of giants, but those giants were propped up by the non-giants around them.

Our world was built by backwards savages. The good news is that we can use the flimsier parts of the social structure we inherited as scaffolding for something better (while maintaining the really good stuff). What exactly this means is the tricky question. Which rules, traditions, organizations, and processes are worth keeping? How do we maintain those? How/when do we replace the rest? And what does “we” even mean?

Changing the world involves uncertainty. There are complex interrelations between every part of reality. And the knowledge society needs is scattered through many different minds. To make society better, we need buy-in from our neighbors (nobody rules alone). And we need to realize that the force we exert will be countered by an equal and opposite force some plural, imperfectly identifiable, maybe-but-probably-not equal, and only-mostly-opposite forces. There are complex and constantly shifting balances between different coalitions vying for power and the non-coalitions that might suddenly spring into action if conditions are right. Understanding the forces at play helps us see the constraints to political change.

And there’s good news: it is possible to create a ruling coalition that is more inclusive. The conditions have to be right. But at least some of those conditions are malleable. If we can sell people on the right ideas, we can push the world in the right direction. But we have to work at it, because there are plenty of people pitching ideas that will concentrate power and create illiberal outcomes.

*I read the audiobook, so I’m basically unable to vouch for the data analysis. Everything they said matched the arguments they were making, but without seeing it laid out on the page I couldn’t tell you whether what they left out was reasonable.

**Whatever that means…

What classes are worth subsidizing?

A friend of mine has a great phrase that captures what’s wrong with about 1/3 of the population. They’re “people who would make good Nazis.” These are the obedient people who are ready to follow orders without thinking without having sufficiently high standards for whose orders they’ll follow.

My question is “what can I do to help my students not fall into this category?” The trouble is that these folks aren’t drawn to intellectual arguments. I need to get them in a more visceral way. I think the answer is art. These kids need to be watching TV shows and movies/shows like Donnie Darko and The Handmaid’s Tale (tell me your favorites in the comments!). They need something that will grab them by the lapels, shake them, and shout “question authority!”

Pragmatic folks (the sort of people who are normally excited to hear what a libertarian economist has to say) would usually think that schools should focus on pragmatic things. It’s certainly a good idea for kids to leave school with some ideas about how to manage their personal finances and research important issues. But the economic justification for subsidies rarely favors such pragmatic topics. Petroleum engineers don’t need their schooling subsidized because they’ll end up getting paid enough to pay off their student loans.

I like to think of myself as a pragmatic person*, but I’m increasingly coming around to the idea that art is worth subsidizing. Even (perhaps) if that means giving money to ridiculous people who argue incoherently against freedom.

Bildergebnis für ned flanders parents

As subsidies go, art is cheap. You don’t need to build anything as complicated as a particle accelerator. You just need to grab some kid out of the nearest Starbucks and give them a few bucks to make something.

You’ll end up paying for a lot of garbage, but life is full of waste (I’d bet good money that any good project involves a good amount of unrealized potential savings that are only obvious after the fact). For that matter, you’ll almost certainly do some degree of harm. If we threw money at art departments (the way we did with STEM departments during the cold war) the money spent on Che shirts could easily fuel the western hemisphere by attaching a generator to Guevara’s spinning corpse.

And the benefits will be vague and arguable. I’m not in the business of selling bonafide snake oil; this idea isn’t a magical cure-all.

In fact, the more you try to measure the benefits, the less benefit you might get. If we could measure important but intangible things like decency and thoughtfulness, we’d already have those things. But when we try to come up with proxies for important things, those proxies quickly become bad proxies. All the more so if we try to reward people for measurable achieving our goals. Funding should be unconditional (and focused on production rather than selection) if we want to avoid funding propaganda. We almost certainly will be funding propaganda, but if humanity is really worth saving, it’s a baby/bathwater tradeoff.

I’ve just spent three paragraphs convincing you that this might be a terrible idea. But I still think the net benefits could justify the cost. Imagine some imperfect estimate of the impact and an even more imperfect measure of the value created. What will we get out of this (on average)? In a word: more. More novels, web comics, paintings, podcasts, and films.

And with more art, there’s more cream to rise to the top. The best art typically encourages thoughtfulness and empathy. This is a “let a thousand flowers bloom” approach that would (at relatively low cost) saturate the public sphere with enough semi-thoughtful stuff to force usually-thoughtless people to think more clearly about the world around them.

If** we can subsidize free thought, this is how we’ll do it. And if it’s possible, it’s worth doing in a world where we clearly have too many people who would make good Nazis.

*If that was really true I’d work in a bank.

**Do I really think this would work? I’m not remotely sure. But I think it’s an idea worth discussing. I teach economics because I hope the marginal return (in terms of improving the “civic quality” of my students) is high. But it feels Sisyphusian at times, and some students are clearly not ready to get it. I worry that they’ll go out into the world ready to follow any maniac’s orders. In terms of the stability of a free and peaceful society, doing something about those people seems important.

Words on the Move

I just listened to a recent(ish) episode of Econ Talk: John McWhorter on the Evolution of Language and Words on the Move.

I particularly enjoyed this episode because:

  1. Emergent order (duh!).
  2. It shed new light (for me) on a category of words that serve a function but don’t really mean anything. “Well” doesn’t really mean anything. Well, sometimes it means a hole filled with water, but in this sentence I’m using it as a “pragmatic.” Other pragmatics like eh, and huh feel like filler, but they’re really a part of oral communication where the speaker can casually and non-disruptively check in with the listener. Pretty cool, huh?
  3. And the discussion of accents was interesting in light of an experience I had just the other day. I’ll get to that at the bottom, but let me set the stage…

I’ve been particularly aware of my own accent since a young age because kids have always been quick to point out how different I’ve always sounded. At around age 7 I moved from the prairies to southern Ontario and I remember some kid asking me if I was British. They might have been picking up on regional variation in the Canadian accent, or it might be that my accent was affected by the movies and TV shows I had watched to that point (I suspect watching Monty Python at a young age deeply affected me).

Later (aged 17) I moved from Canada to Texas where I worked very hard to ditch my Canadian accent and gain some Southern drawl. When I moved to California I kept trying to lose the Canadian parts of my accent but gave up on trying to gain the drawl. When I moved to Boston I picked up some affectations that now makes me stand out on Long Island. I drink kahfee instead of quofee, but since I never did like the mwahll, my pronunciation of “mall” is probably the slightly-off version I would have picked up in my youth.

The other day I was talking to a student and noticed something especially bizarre–as our conversation moved from seafood (note to self: soak calamari in buttermilk for 3 days) to boar hunting I found myself involuntarily moving back into my Texas voice! (You’ve probably already guessed that this was an econometrics student.) I have zero experience with hunting, but I had to suppress this reflexive change in my accent. Somehow, all the automatic processes in my brain have lined up in such a way that made it clear that not only do I have a lot of tacit knowledge, but I even have unseen triggers for how I communicate.

Rules for Rulers

Watch to the end for details about the book (by Bruce Bueno de Mesquita and Alastair Smith) this video is based on.

  1. I think readers of NoL will enjoy this nicely condensed public-choice-y analysis of the constraints involved in operating (and thus changing) a government.
  2. The audiobook is available on Overdrive, so you can borrow it from your library. I’m just started listening to it and I’m enjoying it immensely.
  3. I suddenly found myself as the benevolent dictator of some country. My long-term objective is to shape my society into a libertarian utopia. Here’s my plan to deal with the constraints discussed in the video: all of my advisors are required to play devil’s advocate when I propose some change. Yes-men will be summarily executed. Assuming I stay benevolent but also ruthless, does my devil’s advocate scheme work out? Please discuss in the comments. Anyone who doesn’t earnestly try to poke holes in my idea will be sent to the work camps.

A long read

According to Instapaper this article at Wait But Why is a “139 minute read.” And it was time well spent.

It’s about a new Elon Musk venture, Neuralink, but there’s plenty non-Musk stuff in there of interest. I’m agnostic on whether Elon Musk is or isn’t the next coming of the (anti-) Christ. What’s really interesting is the background material this article gives, building up a highly entertaining natural history of knowledge. The section below really captures the main thrust of that story, but it’s worth reading anyways.

minimal tribal knowledge growth before language

And this:

That leads into a discussion of how brains work, that “soft pudding you could scoop with a spoon.” Here are some excerpts:

I’m pretty sure that gaining control over your limbic system is both the definition of maturity and the core human struggle. It’s not that we would be better off without our limbic systems—limbic systems are half of what makes us distinctly human, and most of the fun of life is related to emotions and/or fulfilling your animal needs—it’s just that your limbic system doesn’t get that you live in a civilization, and if you let it run your life too much, it’ll quickly ruin your life.


Which leads us to the creepiest diagram of this post: the homunculus.

The homunculus, created by pioneer neurosurgeon Wilder Penfield, visually displays how the motor and somatosensory cortices are mapped. The larger the body part in the diagram, the more of the cortex is dedicated to its movement or sense of touch. A couple interesting things about this:

First, it’s amazing that more of your brain is dedicated to the movement and feeling of your face and hands than to the rest of your body combined. This makes sense though—you need to make incredibly nuanced facial expressions and your hands need to be unbelievably dexterous, while the rest of your body—your shoulder, your knee, your back—can move and feel things much more crudely. This is why people can play the piano with their fingers but not with their toes.

Second, it’s interesting how the two cortices are basically dedicated to the same body parts, in the same proportions. I never really thought about the fact that the same parts of your body you need to have a lot of movement control over tend to also be the most sensitive to touch.

Finally, I came across this shit and I’ve been living with it ever since—so now you have to too. A 3-dimensional homunculus man.17

This is too far outside my area of specialization to say, but it’s certainly an entertaining read that seems to fit with what I know about these topics (although the section on neurology could be made up as far as I know).

From there it builds up to the moon shot idea Musk apparently has in mind: building the core technology for a high bandwidth mind-computer interface. This would be the ultimate logical extreme of a trend towards better interfaces that’s been going on since before punch cards. If you think over the natural history of knowledge, it becomes clear that this idea is ultimately just a few dozen steps further down a path we’ve been on for billions of years.

And the implications of taking it that far are profound. The pros and cons of that power are huge. Consider how much more powerful your brain is with paper and pencil than without. Or a computer. Or a computer with a GUI and a copy of Excel. Once you can plug into your computer Matrix-style, all those awesome hot keys that let you zip through your computer like a pro will be like roller skates next to a rocket sled. And the two-way link would mean we could genuinely exercise some self control… for example,  by running a computer program that zaps you when you eat too much chocolate cake.

Readers of this blog will hear Hayek warning you! Such a device gives you a lot of power to manipulate a complicated thing in ways we may never be able to understand.

But this type of personal power might be a necessary bulwark against government or corporate power. Network externalities have already locked us in to Google and Facebook. A Byzantine government has created rent-seeking opportunities that puts enormous power in the hands of the politically connected. The NSA is terrifying. And machine learning will continue to get better, giving those entrenched players even more ability to understand and manipulate large numbers of people. (I’m not endorsing this forecast, just listing it as a possibility.)

In any case, even if Neuralink is just an April Fool’s joke I missed out on till now, this article provides a theory of knowledge that’s well worth reading.

In the near future I’ll argue why you need such a theory of knowledge. Stay tuned.

A quick rant on NY’s Excelsior Scholarship

Long Island Business News had a cover story last week: “Free for all?

And the answer is no.

NoL readers don’t need to be reminded that there ain’t no such thing as a free lunch. But I want to focus on the “for all” aspect. And the answer there is also no. This is a program that benefits the middle class and simply won’t be available for the poorest kids in the state.

There are a lot of different programs for paying for schooling costs, and I don’t want to get bogged down in specifics. So here’s (roughly) how this new program works: full time students whose family income is below (approximately) the 75th percentile get more money for school. That money goes away if they stop meeting those criteria.

This is not going to be helpful to poor students who don’t have to resources necessary to go to school full time. It sounds inclusive, but they might as well make the income requirement family income between the 60th and 75th percentile.

In the best case scenario, we might end up getting a positive return on this program (generating more tax revenues from more productive workers). But we still have to ask about what alternatives were possible.

Here are three problems with that outcome:

  1. If those kids were going to go to school anyways, then we’re just creating a common pool problem where costs and benefits aren’t compared by the relevant decision makers.
  2. If some of those kids weren’t going to go to school otherwise, then we’ve increased the pressure on poor kids to get a college degree without helping them out. And if we’re thinking of this like an investment, the returns would be higher on getting more poor kids to go through school.
  3. If this program doesn’t have a return on investment high enough to offset the costs, then that budget line has to compete with some other program (tax returns would be nice, or investment in infrastructure, or something else).

I don’t expect any legislation to solve the problem once and for all. But this program is more likely to make the underlying problems worse, at the expense of poor people, and with little net gain. Not only is this bad economics, it’s not even in line with the more honorable goals of progressives. It’s simply a way for politicians to buy votes with other people’s money.