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This is exactly the problem: it is impossible to measure how much advertising helps. And maybe there are some measurements but they are not known.

You might be right or you might be wrong. For example, I do not see Tesla commercials on TV so I wonder if they will sell more cars in next decade if they advertise as other car companies? Is Tesla making a mistake?

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> it is impossible to measure how much advertising helps

That is false. It is impossible to measure exactly, but statistics can put a range on it, confidence intervals, and other such things (which I've mostly forgotten since school). We can measure all this to close enough.

If a competitive alternative cool electric car appears, and they use advertising to steer the opinion of the public of being the best electric cars on the market ... I think Tesla will start advertising!

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