In the beginning we teach with pictures and words. The student is graded on grasp and agreement.
Here is a clip from a book that was too complex (as its author and publisher offer as explanation for its low market following) for students to understand.
Notice how clear the drawing is. That makes it easy to accept as true, even complete. The abstraction makes its shadow, the application obvious.

Consider though the words that are slipping into your mind. The bold statement seems a truth by definition.

A scarce thing is limited.

In human terms(disparity of scales within space and time), all things are limited. Most calculations are finite. We expect “an” answer, and we get it, “32”. With the example offered, by the way this example is meant as a real world example to students, and as an example of reality, of shared experience, it assures easier agreement with a conclusion. “I can’t be fooled if I use my own life to gather… from.”

… is the most books you can CONSUME because you are not infinately WEALTHY.

Here consumption is braided into wealth (money-cost based market)

.

Thereby this teacher has demonstrated to us, that consumption is limited, not by books but by our wealth. S/he will also prove that we will have to realign our wealth among various items which we will consume by owning them.

And poof just like that, the demon of err.nomics has taken away any and all other ways of thought about resources. About consumption. They are all replaced with the other notion.