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I think the problem is that for most ads, impressions are the bulk of your value. For example, a company might advertise so that when you do actually need their

I think the problem is that for most ads, impressions are the bulk of your value. For example, a company might advertise so that when you do actually need their service, they come to mind first.

Grishnakh 11y ago
For ads on TV, billboards, etc., that's true. For web ads, I thought that most places had given up on charging by impression, and only charged by click-through.