The U.S. government has filed a landmark antitrust lawsuit against Amazon, pointing to a set of familiar features that have made, the internet retail giant so beloved by consumers.Karen Weise, a technology correspondent for The Times, explains why those features may actually be illegal.Guest: Karen Weise, a technology correspondent for The New York Times.Background reading: 

• The Federal Trade Commission and 17 states have sued Amazon, saying its conduct in its online store and services to merchants illegally stifled competition.
• The F.T.C. says there are two main tactics that Amazon used to undermine competition. The company says it will contest the lawsuit.

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