Earlier quoted context omitted.
> You can only buy the new Jordan's from X stores, only available on PS4, exclusively at Target, etc. When this matters is when you have a dominant market position. Target doesn't have to sell Nike because you can reasonably buy them at Walmart. Nike doesn't have to sell to Target because Target can reasonably buy from Reebok, which is a reasonable substitute. The issue here is that there is no reasonable substitute…
> So Apple has a dominant position in iOS app distribution Is iOS app distribution a thing that can be dominated though, legally? In your example I get how stores and shoes are both things that can be dominated but what category of thing does iOS app distribution fall into? Is it still in the same category if one deletes iOS and just calls it in "app store"? Would Apple still dominate apps? It's all confusing to me.…
So for example, is "Clorox bleach" its own market, separate from just "bleach"? Well, no. Clorox bleach is chemically identical to any other bleach. You could switch one for the other and not even be able to tell the difference.
On the other hand, is "broadband internet service in Pittsburgh" a different market than just "broadband internet service"? It kind of is. There may be a dozen different ISPs in varying cities across the country, but the prerequisite to using one that doesn't offer service in your city is to sell your house and move somewhere else. That doesn't make it a particularly viable substitute.
So then is "iOS app store" a different market than just "app store"? Well, what do you have to do to substitute one for the other? Is it reasonable to have to exchange your $600 phone, or buy a second $600 phone, in order to buy a $1 app from a different store?