Last month, a bipartisan group of U.S. House lawmakers introduced a slate of bills aimed at addressing the power of dominant tech firms — namely, Facebook, Amazon, Apple, and Google. Each of these companies has been accused by regulators in the United States and Europe of engaging in anticompetitive practices, and the proposed U.S. legislation could help pave the way for one or more of them to be broken up, among other possible remedies. Of the big four, Amazon has given the clearest picture yet of how its business might change if the proposed bills become law. And the first piece of its empire to go might be its massive third-party marketplace. Read more at CNN Business.