Theory of Relativity
The structure of any economic system can be evaluated and shaped according to their nature; in the first-degree linear equation we will have.
Y = x + 1
Explanation: The more x, the more y, the more y changes, the more is variable x.
The second explanation is the principle of relativity in microeconomics that shows the higher the supply of a commodity, the lower the price of that commodity is, also the higher is the demand for it, on the contrary the lower the supply of a commodity, the higher the price will be according to demand.
Third, almost the economy in its entirety is based on this notion that how plans work.