ABSTRACT
Throughout science, descriptions of quantifiable data use specialized terminology to name measurements. Especially where there are formulas and equations, one finds variables and constants. The famous e = mc2 equation has variables e for energy, m for mass, and the constant c for the speed of light. Economists talk about quantities in markets, sometimes using vocabulary like “exogenous variables” of an economic system. Common to different areas such as physics or economics is the root meaning of the word variable, the verb vary-the variables of a system are the things that vary over time. A constant, however, is something that does not change.
