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While its not science - it is a perfectly valid application of scientific method on a small scale. He's got a variable he measures - the money he has coming in, and a single variable he changes - whether he wears a suit or a tshirt.

To make it more reliable he should have repeated it several times.

If he had done that then I don't see why this is an invalid way to prove his hyothesis.

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Also completely unscientific:

If I saw a kid out in front of his grandmother's house in the summer wearing a suit selling lemon-aid, I'd purchase it and probably add a tip:

- It's the middle of summer[1] and the kid is serious enough that he's willing to sweat it out in a suit. That's an attitude I'd respect.

That would be my instant, gut reaction, walking by that stand for the first time.

[1] I'm assuming he's not selling lemon-aid while attending school

Yeah, I mean, it's like it's more scientific to bring all of those people into a clean room where the weather is constant and then ask them how much they want to buy lemonade -- that's even further away from proving what he wants to prove.

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