Hook

Their other posts in the index, biggest breakout first.
If you have 3 price points, small, medium, large. Where you move the middle will dictate how many of them you sell, even if you keep the small and the large at the same price. For example, let's say that we've got $5 and $10 as these things. If I put the middle very, very close to the top, the top one will look like a steal compared to the middle, because it's only 10% more and I get a lot more stuff. So if I wanted to sell more larges, I would push the medium right next to it to make it seem like a no-brainer upsell psychologically. On the flip side, if I wanted to sell more of the middle, I would expand the distance between the large and the middle, so the middle would look like the more reasonable option compared to the premium price. You should always have a very expensive thing because you can drive more sales to the middle, while also allowing people who want to spend the $$$$ the expensive thing.