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They broker transactions. The "good" they produce is the marketplace. eBay is just a website, they also broker transactions to create a marketplace.

Producing goods is often not as profitable as owning the market and taking a cut of every transaction.

By that definition, the early google didn't produce goods either ;) they provide a ~ valuable ~ service (the good)

I think the OT is referring to cases that don't have advanced technology as a competitive advantage...