What is the formula of MMR?

The formula for the Maximum Marginal Return (MMR) is typically expressed as the change in output or return resulting from an additional unit of input, often represented as MMR = ΔOutput / ΔInput. In a broader context, MMR can also refer to the relationship between marginal cost and marginal revenue in economics. However, if you meant a different context for MMR, please specify for a more tailored response.