I assume this is a metaphor. But even for products that _are_ byproducts, it seems like the correct solution is to sell the less-popular one at a lower price.

Or... not buy it, as c3534l suggested. The fact that I produce egg whites and egg yolks together doesn't mean everyone who buys my whites is obligated to also buy a proportional quantity of yolks. That would defeat the whole purpose of separating them in the first place.

It wouldn't defeat the purpose at all but it is along the lines of the point I was making.

The yolks are a by product no matter what.

There was an interview on the Daily show or last week tonight where they made fun of a guy eating a plate of fried eggs that looked like 5 yolks and 2 egg whites. My guess, the dinner sells a lot of eggwhite omelettes and makes use of the extra yolks as another option for other people to buy.

In the supermarket scenario, the supplier only has one customer and has to somehow make them buy both no matter what.

The "cheese" part is also questionable...