Final answer:
In economics, mathematical equations are often used when words are insufficient to explain the quantitative relationship between two variables. These equations help illustrate economic concepts and manipulate economic models.
Step-by-step explanation:
In the study of economics, when words are insufficient to explain the quantitative relationship between two variables, economists often use mathematical equations as a tool. Mathematical equations help illustrate economic concepts and can be used to manipulate economic models. By using equations, economists can show the mathematical relationship between variables such as stimulus and response or cause and effect.