Here in San Diego, when I try to buy an sausage & egg mcMuffin, they always try to sell me two, because it is the same price as one. The only logical explanatio

Here in San Diego, when I try to buy an sausage & egg mcMuffin, they always try to sell me two, because it is the same price as one. The only logical explanation I've come up with is that when I gift the excess sandwich to someone, it anchors the brand in that person's mind. Viral marketing of sorts. Or maybe they want to fatten me up, so I return in the future to order more food. It could also be that there is no rationale other than that they've found it to increase sales. Maybe they can't explain why it increases sales, but they do it because it does. Sort of like A/B testing in web. They also employ other gray marketing tactics, for example on the combo menu they'll put the price for the "small", however if you neglect to specify a size when ordering you receive the "medium" by default, which results in your total being more expensive than you thought it would be. I guess because of their disclaimers, its not legally false advertising.