Nationally, the average price for regular gasoline around $2.50 per gallon. Are gasoline prices high? That's not the best way to put that question. It's akin to asking, "Is Williams tall?" The average height of U.S. women is 5 foot four. For men, it's 5 foot 10 inches. Being 6 foot four, I would be tall relative to the general U.S. population. Put me on a basketball court, next to the average NBA player, and I would be short. So when we ask if a price is high or low, we must ask: relative to what? In 1950, a gallon...