Temporal Neutrality Implies Exponential Temporal Discounting

How should one discount utility across time? The conventional wisdom in social science is that use an exponential function. Such a function representation of the axioms provide well-defined plus condition known as stationarity. Yet stationarity doesnt really have much intuitive normative pull on its own. Here I try to cast it glow by deriving from two explicitly premises, both suggested philosophical thesis temporal neutralism. Putting argument this form helps us better understand discounting and challenges it.