Final answer:
The concept of diminishing returns states that as more units of a variable input are added to a fixed input, the marginal product of the variable input will eventually decrease. It is a key concept in economics and can be observed in various industries.
Step-by-step explanation:
The concept of diminishing returns is a key concept in economics. It states that as more units of a variable input are added to a fixed input, the marginal product of the variable input will eventually decrease. In other words, the additional benefit or output gained from each additional unit of input will diminish over time.
For example, imagine a factory that produces cars. Initially, as more workers are hired, the production of cars increases at an increasing rate. However, at some point, adding more workers becomes inefficient, and the additional cars produced by each additional worker start to decrease. This is an example of the law of diminishing returns.