What is an isoquant?

An isoquant, derived from the words 'equal' and 'quantity', is a contour line drawn through the set of points at which the same quantity of output is produced while changing the quantities of two or more inputs.

Here are the steps to understand it:

1. Isoquants are used in economic theory to represent production functions.
2. A production function represents the technological relationship between quantities of physical inputs and quantities of output of goods.
3. The isoquant map describes the input-output combinations of the production function while keeping output constant.
4. Each isoquant on the map represents a different level of output, and each point on an isoquant signifies a specific way to achieve that output by combining different amounts of inputs.
5. Isoquants are often compared to indifference curves in consumer theory, as both concepts represent different combinations of two goods (inputs in the case of isoquants, consumer goods in the case of indifference curves) that an individual or firm can consider equivalent.
6. The slope of an isoquant represents the rate at which a firm can substitute between the two inputs, without affecting the level of output, also known as the marginal rate of technical substitution.