Two CowsThe idea of the "Two Cows" metaphor comes from economics. It consists of simplifying a complex system into a simple one, starting with the phrase "You have two cows", in which cows stand for something that produces, milk stands for what is produced, and a number of other metaphors are thrown in as needed. For example:
Capitalism (in theory): You have two cows. Your neighbor has two bulls. You trade a cow for a bull.
Capitalism (in practice): You have two cows. You sell one cow. You try to extract three cows' worth of milk from your remaining cow. You briefly wonder why you have one dead cow, and sell the farm that was able to get three cows worth of milk from one cow. Screw your neighbor; if he deserved any milk, he'd have something to trade for it.
Communism (in theory): You have two cows. Your neighbor has two bulls. Your neighbor lets anyone who wants borrow xir bulls. You give all of the milk aside from what you need to anyone who needs it.
Communism (in practice): You have two cows. You give all of the milk to the government, and get back slightly less than you need. A bull occasionally visits your farm, but you never know when.
This idea has spread to other areas, but aside from giving a few examples of this it isn't relevant to the post:
Objectivism: You have two cows, and a farm that your ancestors stole, but it's okay because the other owners weren't using it as well as you are. Your neighbor mentions that he'd like some milk. You poison one of your cows to make a point, subject your neighbor to a five-hour rant, and take your remaining cow into the mountains.
Judaism: You have two cows. You give some of your milk to your neighbors in exchange for some of their crops. Your neighbors set their crops on fire, blame you, and take one of your cows as reparation. You move someplace else. Your old neighbors tell your new neighbors that you stole one of their cows.