Why are eggs sold by the dozen instead of 10? Factors 2,3,4,6 >>> 2,5. The real reason probably has more to do with switching costs for ports, &c. That, and

Why are eggs sold by the dozen instead of 10? Factors 2,3,4,6 >>> 2,5. The real reason probably has more to do with switching costs for ports, &c. That, and copious people making fat piles of cash off of the status quo.