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Ads are not bad; ads can be great

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To the extent that ads cause you to make purchases that you're retrospectively happy about, I agree. The limit case of a really good advertising system is a recommendation engine for arbitrary products, which is super useful. There are a few reasons why I think they don't converge to that though.

  • Different products have different margins that are uncorrelated with how useful they are to use, and this distorts the recommendations.

  • Advertising systems are competing to cause you to buy via them, and that causes them to expose you to more ads than your desire to purchase things would warrant.