Decreasing, or diminishing, refers to a reduction in quantity, size, or intensity. This concept can apply to various contexts, such as population growth, where the number of individuals in a group declines over time, or temperature, which may drop as the day progresses. In economics, diminishing returns occur when adding more resources, like labor or capital, results in smaller increases in output. For example, a farmer may find that adding more workers to a fixed amount of land leads to less additional crop yield per worker, illustrating the principle of diminishing returns.