It isn't true that auto dealerships cost consumers 26 billion a year, but Elizabeth Warren has said it a number of times. The number comes from one ill-constructed study.
I'm not going to expect Warren to retract what she's been saying-- this seems like a lot to expect of any politician-- but I'm curious to see whether she stops using the number.
The Washington Post holds politicians responsible for the quality of the sources they cite. This seems reasonable, especially considering that politicians have staff members who can check on whether sources are accurate.
Meanwhile, if you'd like to see studies being poked at for whether they make sense, I recommend Slate Star Codex.
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