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Ads must work. If they didn't then companies wouldn't pay for them.
Scams also work. Scams and ads are similar, but one is legal and the other isn't.
If you try to convince everyone you meet that they need a particular something eventually you'll find someone who will believe you.
I guess advice in general is kind of like ads, only without the interest in profit since there is no profit in giving out advice. Part of the reason I went for the Toyota Avalon was because Slowmover convinced me I'd be safer in a bigger car. I could have bought a more economical car if I hadn't listened.
Maybe pickup trucks are so wide because someone goes around giving out advice to car manufacturers telling them they should make their trucks wide.
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