A long time ago I worked at a children's toy store and among other things I was responsible for ordering and restocking the bins full of small loose toys that cost under a buck or two.

A weird thing I noticed was that if an item came in an assortment of colors that included yellow, yellow was always the slowest color to sell. Often bins would end up with just yellow inventory after all the other colors had sold. But I discovered that if I removed the yellow samples from the bin entirely that the overall sales for the item would plummet.

I'd often joke that we should open up another store that only sold yellow merchandise as a way to move the excess inventory that built up from me implementing a yellow-buffering system, but instead we'd just end up donating them to a school or giving them away on Easter or whatever.