There's a known cognitive bias that kicks in with 3 items, realtors for example will exploit this. They'll show 2 similar houses and 1 different house, people

There's a known cognitive bias that kicks in with 3 items, realtors for example will exploit this. They'll show 2 similar houses and 1 different house, people will end up comparing the two similar houses more, and choose the one that's more of a bargain.