diminishing returns 和 diminishing marginal product 有什么区别?

1:A point beyond which the application of additional resources yields less than proportional increases in output.
2:A decrease in how quickly the output of a production process grows in response to more of one input.Diminishing marginal product is used to identify the point of diminishing returns,at which adding more of a material needed for production begins to have less of a benefit to the output of the process.