When I was younger, I once asked my father why in the supermarket certain jars of peanut butter cost so much more than others. He pointed out to me that the cheaper jars of peanut butter used filler ingredients — peanuts are more expensive than sugar and corn syrup, and so the more filler there is in a jar of peanut butter, the less it costs the manufacturer per jar. Similarly, when you are dealing with vegetable oils, the way it should work is that you pay more for pure olive oil than you do for a blend of olive oil and other oils because pure olive oil is more expensive. Moreover, extra virgin olive oil (referring to the oil that comes from the first cold pressing of the olives) is even more expensive because of the quality of the oil that comes from doing this first cold pressing versus the subsequent oil that comes from further pressings and extraction methods.
