What is meant by 'law of diminishing returns'?

Answer:
At some point in any process, effort expended eventually produces less and less return. As an example, weeding a garden produces great results in the first hour or so, but further effort produces less and less result.
First answer by Mycroft414. Last edit by Mycroft414. Contributor trust: 229 [recommend contributor recommended]. Question popularity: 14 [recommend question].