Gossen's laws
Gossen's laws are three laws of economics that were articulated by Hermann Heinrich Gossen :Gossen's First Law is the law of diminishing marginal utility: that marginal utilities are diminishing across the ranges relevant to decision-making.Gossen's Second Law, which presumes that utility is at least weakly quantified, is that in equilibrium an agent will allocate expenditures so that the ratio of marginal utility to price is equal across all goods and services.Gossen's Third Law is that scarcity is a precondition for economic value.