Originally Posted by
drsmithy
It's one product (lemonade with a cup) where a subset of that product (the lemonade) is all the customer wants.
To make the analogy even passably accurate you need to find a situation in which the second part of the product has NEGATIVE MARKET VALUE when added to the first part even if it would have positive market value alone.
A bar charges $6 for vodka, but only $3 for vodka with castor oil. With your best Jack Nicholson grin you order the latter and ask them to hold the castor oil.