Friday on CNBC’s “Squawk Box,” host Joe Kernen and Sen. Elizabeth Warren (D-MA) debated Democratic presidential nominee Vice President Kamala Harris’ policy suggestion of implementing price controls during a 20-minute contentious interview. Warren said, “Look at what happened to their profit margins. If they had just been passing along costs profit margins would have stayed about the same, but for some industries, some companies, profit margins shot up. Do you know where they shot up most often? It was in industries where there was a lot of concentration, a lot of market power, places where the market is not functioning...