There is a concept in economics called “indifference curves”. These are a graphical picture of combinations of goods that would leave the consumer indifferent between the different combinations. Are two apples and one orange just as good to you as two oranges and one apple? If so, these points can be combined on a graph to form an indifference curve, along with other combinations that also leave the consumer just as happy, or indifferent, among the various outcomes. The result is a graph of lines, similar to those found on a map depicting altitude or weather patterns.