On: Today's XKCD: Microsoft

[sjs382]

I'd say that both Apple and Google both have monopolies over app sales within their ecosystems. And at least one of them seems to be abusing this monopoly power.

[loumf → sjs382]

Walmart has a monopoly on items you can buy at the checkout counters inside of their stores.

The law cares about using earned monopoly power in one market to advantage yourself in another market.