Here's why: Since it assumes that the same items are bought regularly, it doesn't account for the fact that you do not buy a new car every month or every year, or the fact that today's cars are much more energy-efficient than previous ….. Or I end up having odd dinners, like the other night when it was pretty much just eggplant after trying a new recipe (which was good but odd on its own) and having my rice not turn out (as normal). …