Preferences over wealth : experimental evidence

Preferences over wealth can explain why households do not spend more when real interest rates fall, because they save more than optimal under a standard model. However, little is known about preferences over wealth empirically. We run an intentionally simple lab experiment on intertemporal spending and saving decisions with 180 students. Under a positive discount factor, zero interest and linear utility, maximizing behaviour would imply spending any funds instantaneously. While half of the participants behave optimally, we find a robust pattern where participants on average form and maintain a stock of wealth, consistent with wealth entering the utility function directly.