Bryan Caplan reminds us that misinformation wouldn’t work well if people weren’t so irrational.
The [standard misinformation] story focuses exclusively on the flaws of speakers, without acknowledging the flaws of the listeners. Misinformation won’t work unless the listeners are themselves naive, dogmatic, emotional, or otherwise intellectually defective. In economic jargon, the problem is that the story mistakes an information problem for a rationality problem.
The motivation for this crucial omission is fairly obvious. Blaming listeners for their epistemic vices sounds bad. It makes the accuser sound elitist, if not arrogant. Blaming a few high-status liars for the world’s problems is a lot more compatible with Social Desirability Bias than blaming billions of low-status fools who fail to choose to exercise their common sense.
I agree but it’s an equilibrium process. The demand and supply of misinformation both matter. Moreover, it’s not implausible that social media has increased the supply of misinformation, essentially because