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Think the super unsatisfying answer is:

¯\_(ツ)_/¯

I think a lawyer would advise that that trade would come with a ton of risk. But the law isn’t clear. Generally, the SEC’s goal is to make sure markets are “fair.” What makes a market fair is hard to define.

If you do a ton of work to launch satellites to fly over Walmart parking lots and then model the correlation of how full they are to what the company’s next earnings will be: that seems like you worked hard and earned an edge you can trade on without getting in trouble. Feels like anyone has a theoretically equal opportunity to do the same work you did and get the same trading edge. That feels fair.

Your hypothetical feels less fair. Is it unfair? Maybe? So unfair that it’d be prosecuted? Probably depends on a number of things, including how much you made on the trade. At a minimum it’s an area of unsettled law. And you would almost certainly be in for serious scrutiny and a legal fight.

Supposedly one idea for Google’s business model early on was that they should use search query data to trade equities. After they researched it they concluded it would be considered insider trading. Though it’s hard to distinguish from overhearing something on the train, which (not legal advice) generally has not been. Think the difference at some level is scale and intention. And, I’d guess, if you made it your business to ride the Acela every day between Greenwich and NYC, bought special hearing aides that let you better eavesdrop on conversations, and made significant profits trading on the information then you’d be more likely to be successfully prosecuted.

But… how is that different from flying satellites over Walmart parking lots?

¯\_(ツ)_/¯

Sometimes the law is intentionally a bit unclear. Usually in areas like this where you care about a general concept of fairness and want some caution and buffer at the margins.



That framing makes a lot of sense, and does help square the difference between the "satellite imaging of Wal-mart parking lots" and "trading on intel you got working bizdev at a tech company".

It's funny how often "we'll trade equities on the information we generate as a byproduct" comes up --- always briefly --- as a tech company business model. Like, I've non-ironically been involved in companies that had that premise, and then "real" business always swamps the "we'll trade on it" intentions.


So since you mention Wal-Mart. They have, probably, a better idea of Proctor&Gamble's quarterly sales than anybody but P&G, right? Like Walmart makes some massive double digit percentage of sales of p&g products, and knows about it possibly in real-time. If I was some data analyst at Walmart,I couldn't trade on that, that's misappropriation. But Walmart could potentially spin up a hedge fund and trade (against) their suppliers, until their suppliers threaten to pull product, I think?

Presumably there's a contract between Walmart and p&g that they won't trade in each other's stocks, specifically to prevent this?


¯\_(ツ)_/¯




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