What economic truth does Luoyang's allusion to expensive paper contain?

This idiom refers to the work Sandu Fu written by Zuo Si in the Western Jin Dynasty. Because of the good writing, everyone is scrambling to copy, which leads to the tension in using paper. . . Personally, I think it is a little exaggerated, or it may be because the output of paper at that time could not be compared with today.

This phenomenon is the most basic law of market economy: if a commodity is in short supply, the price will inevitably rise, leading to a decline in sales, hoarding goods, resulting in oversupply, and then the price will fall, sales will increase, and supply will be in short supply again. . . Such a reciprocating cycle, this is the self-regulation ability of the market. In fact, the scarcity of resources and the elasticity of supply price at a certain moment reflect the contradiction between supply and demand in a large number of purchases, which leads to the skyrocketing price.