How do you suppose that when soft drink sellers introduced cans containing 7.5 ounces of soft drink to sell alongside traditional 12-ounce cans, they managed to offer the soft drinks in the smaller cans at prices that were several cents higher per ounce of soft drink?
Why do you think that most economists seek to study prices measured in terms of dollars per unit as measured, say, by weight or by volume rather than by prices per package or per container? Explain your reasoning.