This paper investigates the empirical labour supply behaviour of self-
employed solo practice physicians. The specification of the empirical
labour supply equation is based on a model of constrained utility-maxi
mizing behaviour that recognizes the physician makes work/leisure choi
ces based on an endogenous shadow wage and faces a non-linear budget c
onstraint. The findings suggest that the typical self-employed solo pr
actice male physician operates on the upward-sloping portion of the la
bour supply curve and is relatively unresponsive to changes in margina
l hourly medical practice earnings and non-practice income.