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Nov 18 17 tweets 7 min read Read on X
🚨 HUGE: The court just dismissed the FTC's case against Meta (related to Instagram/WhatsApp)🚨

It is mostly a market definition decision (boring), but the Judge looked to do a good job on the economics behind market definition.

Let's go through it 🧵 Image
The vibe is set in line 1: Heraclitus and never stepping in the same rivier twice.

Whatever you think of the initial decisions to not block acquiring WhatsApp, we're dealing with the world as it exists today.

Social networking overlaps with social media today. Image
FTC tried to define a "personal social networking" market that excluded TikTok because it's about entertainment, not friends.

Judge rightly wasn't buying it.

To define markets today, you need to look at how consumers behave TODAY
And there's lots of evidence consumers readily switch between Facebook and, say, YouTube.

We see this in two ways. @Econ_4_Everyone ran an experiment that paid people not to use Facebook. Where did they go? YouTube Image
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@Econ_4_Everyone When Facebook and Instagram went down in 2021, where did users go? TikTok, then YouTube.

Much more than went to Snapchat, supposedly the only real competitor for Meta's products Image
@Econ_4_Everyone It's good that courts require real evidence of substitution, not just stories about product features.

But it's also frustrating that so much hinges on these market definition games. I don't think the FTC had a good case if it had included TikTok and YouTube
@Econ_4_Everyone There's interesting stuff on prices. What do you do when prices aren't normal prices?

They look at quality-adjusted prices. Basically, did quality improve? If it did, that's some evidence against Meta having monopoly power.

"All evidence points toward [features improving]." Image
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@Econ_4_Everyone The court's point about high profits was standard but worth noting:

High margins don't prove monopoly. Could be efficiency, good management, or lucky bets.

We've heard this before, but judges keep having to repeat it. Image
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@Econ_4_Everyone A few years back, @AuerDirk, @ericfruits, and @geoffmanne wrote a paper on "Doomsday Mergers" and Facebook-Instagram was one of our examples.

Basically, people are freaking out but competition is fine. The Judge agreed with us. laweconcenter.org/resources/doom…Image
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@Econ_4_Everyone @AuerDirk @ericfruits @geoffmanne This caught my eye as well. There was a lot of pre-judging in this case. The Judge say that
@Econ_4_Everyone @AuerDirk @ericfruits @geoffmanne Speaking of pre-judging, this is full circle for Lina Khan's fight against Meta.

Her tenure started with a loss against Meta/Within.

In that case, she brought it, against the staff's recommendation (and didn't recuse herself for prejudgin)
thedispatch.com/article/the-ft…Image
TBF, it's not just Khan's FTC. The current one has some reactions to the loss...
I can't help but think back to @geoffmanne and @corbinkbarthold's discussion of this case

There was a lot of laughing about the market definition. And that basically was right!
podcasts.apple.com/us/podcast/384…
While I hate a market definition case, there are some bright spots. It wasn't about the qualitative features that

"the touchstone of market definition remains how consumers would respond to a price increase" Image
Again, its about substitution Image
I'm very happy to see avoiding all the Brown Shoe submarket nonsense. Image
Let me clarify what I mean about not liking a market definition decision.

I don't think 90% or 50% or 30% tells us whether consumers would be better off if we split of Instagram. I don't think they would, but its not about market share

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More from @BrianCAlbrecht

Nov 17
Economists hate this idea (price controls) for good reason!

The policy fails to achieve its own stated ends and wreaks havoc along the way.

A few thoughts on this particular defense of price controls 🧵 Image
Piece here nytimes.com/2025/11/16/opi…

Good response from @JohnHCochrane already grumpy-economist.com/p/price-contro…

I'll add/expand on a few points
Price controls are apparently a good idea because supply responses take years. But this isn't true.

Suppose you announced a full upzoning of a city. First, what would happen to prices in neighboring cities?

(Stay with me, this is an easier question.)Image
Read 11 tweets
Nov 12
Semiconductors are clearly one of the most important industries in the world. They run everything: AI, cars, the digital economy.

Yet people haven't focused on market competition in this industry.

New paper out with @geoffmanne, David Teece, and @MZunigaP remedies that Image
Link to paper:

When you start studying semiconductor manufacturing, two things immediately pop out.

First: Moore's Law.

Tech people may see this as some inevitable technical progression. laweconcenter.org/resources/from…Image
But as an economist? Moore's Law screams Schumpeterian growth and quality improvements. Yes, some of it is coordinated.

But most is competition to be that next step.

This creates a relentless beat, where if you fall behind by even one cycle, you can lose customers for years.
Read 26 tweets
Oct 30
🚨 Updated paper alert 🚨

"Market microstructure and informational complexity" with @GuthmannR

Why do we have organized markets with intermediaries like NYSE or Amazon?

Our answer: they drastically reduce the information burden on everyone else.

Here's how we get there 🧵 Image
Hayek taught us markets require minimal information. Traders only need to know prices, not everyone's preferences or endowments.

This generated formal proofs, particularly from Jordan (1982)

The competitive market is uniquely informationally efficient, or minimally complex. Image
But who sets those prices? Markets need actual mechanisms.

We ask: which trading mechanisms preserve this minimal informational complexity?
Read 11 tweets
Oct 22
Two macro trends over 40 years:

- Rising markups
- Falling business dynamism

Are these related? Many economists say so.

@UpdatedPriors and I have an updated paper where we take an IO approach and look sector by sector.

Spoiler: The industry data tells a different story 🧵 Image
Image
The economic logic makes some sense:

Higher markups → firms have market power → barriers keep out competitors → less entry/dynamism

This story is so widely accepted. It's in the background of all antitrust discourse.

But what happens when we test it at the industry level?
Plot twist: no relationship.

If anything, industries with BIGGER markup increases had SMALLER dynamism declines.

That's the opposite of what the market power story predicts.

We checked this relationship every way imaginable. Image
Image
Read 10 tweets
Oct 15
Anthropic just released policy proposals.

There are actively bad ideas, generally good but unrelated to AI, and others that miss the forest for the trees.

I read the overarching framing as "how do we minimize harm?" not "how do we harness benefits and navigate trade-offs?"
AI is bad, so tax it! Okay?

It's not exactly clear what the externality is, but we don't just tax everything an some economist calls an externality. Image
We've already been through this with taxing "robots".

Papers designed to find benefits of this type of tax find tiny benefits. economics.mit.edu/sites/default/…
Read 21 tweets
Oct 13
🚨 2025 Nobel Prize in Economics goes to Mokyr, Aghion and Howitt 🚨

"for having explained innovation-driven economic growht"

The best prize in years! Image
For most of human history, living standards barely changed. Then something shifted.

This is THE question. The hockey stick. Why did it happen? What happened?

Modern economics get critiqued for being meaursable stuff that doesn't matter. Not these guys
Mokyr gets half for explaining the prerequisites. This is the first history prize in decades and no deserved.

Aghion & Howitt share half for modeling the mechanism.

Let me break down what they did.
Read 33 tweets

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