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Ads are not bad; ads can be great

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There are two purposes of ads:

  1. Create common knowledge that deals are available

  2. Hoodwink gullible people into taking bad deals.

#1 is strongly positive-sum because it reduces deadweight loss. #2 is strongly negative-sum; the equilibrium is that everyone gets taught about how not to fall for ads, and also that businesses spend large resources on marketing, both of which are losses to society. Back in the 1930s when marketing psychology and communications technology were far less advanced, #1 was the bigger effect. Nowadays it is fairly obvious that #2 is the bigger effect.

You can't uninvent modern marketing techniques, and you can't ban ads without extreme collateral damage, but reducing their effectiveness is almost certainly a net win. Ads masquerading as non-ads are more effective and therefore bad. Ads that are better targetted to people's psychological weaknesses are more effective and therefore bad.

There's also the factor that ads could be trying to do 1, but failing. If the audience is wrong, either due to the individual not caring about the thing in question, or due to the individual already knowing that the deal is available, the ad is not helpful to either party, and is an obstruction to whatever the audience actually wanted to do.