Meditations on Momentum

post by Richard Meadows (richard-meadows-1) · 2018-12-14T10:53:05.446Z · LW · GW · 32 comments

Contents

    1. Popularity
    2. Wealth
    3. Entrepreneurship
    4. Health
    5. Academia
    6. Reading
    7. Market prices
  The Downward Spiral
  Further Down the Spiral
  The Lord Giveth, and The Lord Taketh Away
  Extending a Helping Hand
  Above and Beyond
None
32 comments

Cross-posted and lightly-edited from The Deep Dish.

Epistemic status: describing a general phenomenon; may not be correct on every specific point. may have used scientific terms in an annoying metaphorical fashion. elements of pointing out the bleeding obvious, hopefully framed in a novel way.

tl;dr: positive feedback loops are a thing, thinking in systems/exponentially is hard, intersectionality is underrated.

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“For to everyone who has, more will be given, and he will have an abundance. But from the one who has not, even what he has will be taken away.”

—MATTHEW 25:29

In 2013, unknown author Robert Galbraith published his debut novel… to crickets.

The first print run of The Cuckoo’s Calling was 1500 copies. It’s not clear how many actually sold. The book occupied 4709th place on Amazon’s bestseller charts.

And there, perhaps it would have stayed, if the cuckoo in the nest had remained undiscovered. The secret unravelled after a few months: ex-military security contractor Galbraith was a pseudonym for J.K. Rowling. As soon as the news broke, The Cuckoo’s Calling soared to the number one spot on Amazon. Sales increased by 150,000 per cent overnight. Copies from that first neglected print run are now worth thousands of dollars.

What’s the difference between Robert Galbraith and J.K. Rowling? Clearly, being a talented writer is necessary, but not sufficient. Rowling has momentum on her side. At this point, she could publish the contents of a bowl of alphabet soup, and it would still sell better than 99 per cent of novels by hopeful first-time authors.

This is a ‘no duh’ example, designed to get you nodding your head along. But momentum is everywhere, and it’s rarely in plain sight. Without being consciously aware of doing so, I’ve written about it in four domains:

1. Popularity

Popular things often get their start through what amounts to good luck. The rapid ascent is driven by something even more powerful than rocket fuel: social contagion. Our opinions and preferences cluster together, but it’s not because we’ve carefully evaluated them on their merits. We just want to feel close to our fellow social apes, and have something to gossip about around the water cooler.

In other words, popularity is a lot like herpes. After catching a lucky initial break, it manages to spread to a few hosts, then rides the exponential growth curve until it has planted its gentle, blistery kiss on 60 per cent of the population.

—The Madness of Crowds: Why It Pays to Go Where the Tourists Aren’t

2. Wealth

With enough time on his side, [Fry’s] 93 cents transforms into $4.3 billion. If your gut instincts are screaming that this is staggeringly, ridiculously, wrong—well, you’re not alone.

As Mark Zuckerberg put it: “Humans don’t understand exponential growth. If you fold a paper 50 times, it goes to the moon and back.”

This is a delicious example, not only because the imagery is so jarring—whoa, a tiny sheet of paper can do that?—but because the Zuck himself got it wrong. If you fold a piece of paper 50 times over, it doesn’t make a paltry return trip to the moon—it goes all the way to the freakin’ sun. Humans don’t understand exponential growth, indeed.

—Futurama Taught Me Everything I Know About Compound Interest

3. Entrepreneurship

Something idea-based can be sold over and over again with almost no extra time or effort. It’s infinitely scalable. Your debut album might sell 10 copies (three of which your mum bought) or 10 million, but the amount of work that went into recording it was the same.

Scalable careers don’t follow a normal distribution, with a clear relationship between effort and reward. Instead, they produce grotesque inequalities. It doesn’t necessarily matter how good you are, or how hard you work: a select few people capture almost all the rewards, while everyone else gets next to nothing.

—The Barbell Strategy: Don’t Be a Starving Artist

4. Health

What’s life like for a moderately fit and muscular person? Well, everything works in your favor. The wind is at your back. You’ve got momentum.

The fitter you are, the better your hormonal and metabolic health, the lower your bodyfat, the more relaxed you can be with your diet, the more fun life is, the more motivation you have to train, the cooler feats you can perform, the deeper the habit is ingrained, and so on, in an endless positive feedback loop.

In fact, it’s even better than that. Almost all these factors are mutually reinforcing. If you do screw up, and drunkenly devour an entire box of cereal, or take a week off from the gym to clock a new video game, it’s no biggie. Any one link can seize up for a while, and the cycle will keep on turning without it.

—Fat People Are Heroes

…and a few more examples I’ve collected, but haven’t written about:

5. Academia

Sociologist Robert Merton coined the term ‘The Matthew Effect’, after the parable of the talents line quoted up top.

Merton noticed that famous scientists often get credited for discoveries made by lesser-known researchers or grad students toiling in obscurity. Similarly, the success of any given paper often depends on the prominence of the author, and how many early citations it happens to receive:

So great is this problem that we are tempted to turn again to the Scriptures to designate the status-enhancement and status-suppression components of the Matthew effect. We can describe it as the Ecclesiasticus component, from the familiar injunction ‘Let us now praise famous men’.

—The Matthew Effect in Science, Robert K. Merton

6. Reading

Psychologists have discovered the same effect in education. The longer it takes kids to learn how to read, the slower the development of their other cognitive skills and performance:

The longer this developmental sequence is allowed to continue, the more generalized the deficits will become, seeping into more and more areas of cognition and behavior. Or to put it more simply – and sadly – in the words of a tearful nine-year-old, already falling frustratingly behind his peers in reading progress, “Reading affects everything you do."

—Progress in Understanding Reading, Keith Stanovich

7. Market prices

For most intents and purposes, the efficient markets hypothesis is correct. But even the Nobel prize-winning EMH creator, Eugene Fama, has admitted there is one major anomaly: momentum, which he describes as the “biggest embarrassment to the theory”.

Here’s Fama’s old advisor, Benoit Mandelbrot, on the long memory of market pricing:

What a company does today—a merger, a spin-off, a critical product launch—shapes what the company will look like a decade hence; in the same way, its stock-price movements today will influence movements tomorrow.

…a bottom line emerges. Stock prices are not independent. Today’s action can, at least slightly, affect tomorrow’s action. The standard model is, again, wrong.

—Benoit Mandelbrot, The (Mis)behavior of Markets

Had enough?

There’s also the height of trees, the colour, brightness, and lifetime of stars, the proliferation of  species, the halo and horns effect, affective death spirals, and the existence of life itself.

The principle of cumulative advantage spans physics, biology, psychology, economics, and culture. It almost seems like some underlying feature of the universe. Here’s Mandelbrot again:

“Can you seriously compare the wind to a financial market, a gale to a rally, a hurricane to a crash? In terms of the underlying causes, certainly not. But mathematically, yes. It is an extraordinary feature of science that the most diverse, seemingly unrelated, phenomena can be described with the same mathematical tools.”

On the macro scale of the universe—the birth of stars, complex life bootstrapped from mud—momentum is kind of miraculous. For a brief candle-flicker, we get to resist the relentless march of entropy; create defiant bastions of order and beauty amongst the chaos.

On the micro scale of individual human affairs—wealth, waistlines, popularity, power—momentum is kind of terrifying. It makes us, and it breaks us. The 1 per cent control almost half of the world’s wealth, a small number of startups succeed astronomically, most books are sold by the J.K Rowlings of the world.

Momentum leaves behind a distinctive calling card, which looks something like this:

If this graph was drawn to scale, the tail would extend several kilometres off your computer screen. For self-published ebooks, it’s worse: the median number of sales is zero.

You will know these various patterns as the ‘80/20 rule’, power laws, long-tails, and Pareto distributions. The economist Vilfredo Pareto devoted years to the pattern which now bears his name. Surely he has some kind words to say about his curvy wife?

At the bottom of the [curve], men and women starve and children die young. In the broad middle of the curve all is turmoil and motion: people rising and falling, climbing by talent or luck and falling by alcoholism, tuberculosis and other kinds of unfitness. At the very top sit the elite of the elite, who control wealth and power for a time — until they are unseated through revolution or upheaval by a new aristocratic class.

Yikes!

If each instance of the Matthew effect stayed in its own lane, that would be unfair enough. But as Pareto points out, they’re all hopelessly entangled. Each of these domains – money, opportunity, health, education, talent, prestige – not only compounds on itself; but spills over into the other buckets too. Some interactions are obvious: a successful author will almost by definition make more money. Others are less so: a fit and healthy person might get promoted over an equally-qualified overweight person, for no good reason at all.

And that’s the positive side of the ledger…

The Downward Spiral

My dear, here we must run as fast as we can, just to stay in place. And if you wish to go anywhere you must run twice as fast as that.

—Lewis Carroll

Momentum also works in reverse.

Imagine your partner breaks up with you.  You start drinking more. The drinking affects your work. You become isolated from friends and family. You stop exercising and looking after yourself. Eventually, you lose your job. Now you have money problems, on top of your declining physical and mental health, and total lack of support network. Things don’t tend to deteriorate in a linear fashion: you spiral downwards faster and faster, until you fall off a cliff.

The further down you slip, the harder it is to regain lost ground.

I had a little taste of this recently. A series of bad things came along in quick succession. Each of them would have been OK in isolation; together, they put me into a tailspin. I pride myself on being put-together, but I unravelled disturbingly quickly. Order begets order; chaos begets chaos. It was an uncomfortable reminder that everyone is always only a few strokes of misfortune away from the abyss: there but for the grace of God go I.

Further Down the Spiral

Just to make it explicit: the title of this post is an homage to Scott Alexander's essay Meditations on Moloch. As Scott points out in his epic close-reading of an Allen Ginsberg poem, there are obvious things we could do to make the world a better place, but some invisible force stymies our efforts:

If everyone hates the current system, who perpetuates it? And Ginsberg answers: “Moloch”. It’s powerful not because it’s correct – nobody literally thinks an ancient Carthaginian demon causes everything – but because thinking of the system as an agent throws into relief the degree to which the system isn’t an agent.

The same alien ‘otherness’ applies to momentum. A handful of A-list actors are inundated with roles, when tens of thousands of talented hopefuls would jump at the chance to eat the scraps from their table. One per cent of everyone owns half the wealth, while billions of others are desperately poor.

In every area of life, the people who are least in need of further advantage are most likely to receive it.

Almost everyone is unhappy with this distribution of outcomes, but blaming ‘capitalism’ or ‘the government’ or whichever tribe you happen to hate might be missing the point. If there is some blind force of nature operating behind the scenes, then the exact same pattern will continue to persist (which might explain why socialist utopias don’t tend to go exactly as planned).

Back to Pareto, for more cheerful words of encouragement:

“There is no progress in human history. Democracy is a fraud. Human nature is primitive, emotional, unyielding. The smarter, abler, stronger, and shrewder take the lion’s share. The weak starve, lest society become degenerate: One can compare the social body to the human body, which will promptly perish if prevented from eliminating toxins.”

Assume we are dealing with some kind of all-pervasive force of nature. Moloch works tirelessly to destroy everything humans hold dear. The Matthew Effect/momentum is more like the blind, alien god of evolution [LW · GW]—responsible for creating everything humans hold dear, but in the same mindless fashion, smites entire species into oblivion.

The universe is neither hostile nor benevolent; it’s utterly indifferent. What to do?

The Lord Giveth, and The Lord Taketh Away

The parable of the talents says: you better use it or lose it. Get some momentum behind you. Start saving money as early as possible. Reduce debt aggressively. Build behaviours that compound, and nip bad habits in the bud as soon as possible. Stay the hell away from the abyss.

Saving that first $100,000, as Charlie Munger put it, is a bitch. You have to be the little rocket trying to escape the Earth’s gravitational pull, with all your engines on full thrust. Then you can take your foot off the gas a little, but don’t get complacent. If you lose your momentum, you’ll drift back to earth, slowly at first, then faster and faster, until you slam into the ground at 200 kph.

You have to fight tooth and claw to get some momentum, and then stay up there just as long as you possibly can.

This moral sounds suspiciously demonic. But unlike Moloch’s favourite games, which are zero or negative-sum, climbing the pyramid doesn’t always involve stamping on the fingers of those below you.

Improving your own health and fitness doesn’t make anyone else sickly. Making a consistent habit of reading, or learning new skills, doesn’t make other people dumber. Contrary to popular belief, getting richer doesn’t necessarily make other people poorer. And of course, one of the best ways of getting rich in the first place is refusing to pay a premium for popular things that are popular only because they are popular.

Extending a Helping Hand

If you help yourself without hurting anyone, that’s great, but it still leaves loads of people stuck at the bottom of the curve.

Three encouraging observations: First, even if the overall pattern never changes, at least the individual data-points can move around.

We know this happens, because even mighty empires topple. Generational wealth doesn’t last forever. Celebrities burn out or fade away. Trees get struck by lightning. Stars implode. In dynamic societies, everyone gets their turn at the top.

The second encouraging observation is that momentum reaches a point of diminishing returns.

Sometimes there are hard physical limits: a redwood can only grow so tall before it takes more energy to pump water up from its roots than its new needles can harvest through photosynthesis. After a certain point, a fit person has to train harder and harder to eke out smaller and smaller gains, and so on.

Even where there are no physical limits, there’s a rapid drop-off in marginal utility. A famous person receives more offers and opportunities than they know what to do with. The same goes for wealth. After the first couple million bucks, Bill Gates tells us, it’s the same hamburger.

If you take these two observations together, it makes a lot of sense to extend a helping hand up, rather than keep pushing for smaller and smaller gains. The pattern persists, but you create a lot more mobility up and down the curve.

Above and Beyond

Maybe Pareto was wrong.

The third encouraging observation is that mobility might be increasing, without a bloody revolution. [EDIT: had another look, I don't think the data actually supports me here. damn!]

Human nature is primitive and emotional, but not unyielding. Even though we struggle to wrap our monkey-minds around compound interest—much less social contagion and non-linear causality—we’re getting less bad at it.

It’s pretty cool that J.K. Rowling deliberately tried to play life on hard-mode again. It’s much more exciting that more than 100 billionaires have pledged to give away most (or all) of their fortunes. And that thousands of ordinary people have made a lifetime commitment to give at least 10 per cent of their income to the most effective charities.

The parable of the talents is pretty cut-throat. My guess is that it’s meant to be descriptive, not normative. And lots of people—even those at the top— aren’t OK with it.

Sure, it’s the natural order of things. But nature also gave us strychnine, parasitic wasps, and cuddly meerkats that systematically murder their infants. Nature is not to be trusted.

What’s the moral of the story? As far as I can see:

1. work your butt off to get some momentum behind you,
2. keep a watchful eye out for any signs of entropy creeping in,
3. once you hit the point of diminishing returns, focus your efforts on helping other people up.

John Wesley, the founder of Methodism, delivered a famous sermon on this topic in the 18th century. I think he summed it up more pithily:

"Having, First, gained all you can, and, Secondly saved all you can, Then give all you can."

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