History homework help. “Diminishing marginal utility explains a lot about human behavior. For example, it helps illuminate why diets fail, romances fade, too much exercise harms us, and many other things. Select a human behavior and construct a mini case study that highlights the workings of marginal utility.” This is only one question."Diminishing marginal utility explains a lot about human behavior. For example, it helps illuminate why diets fail, romances fade, too much exercise harms us, and many other things. Select a…