Confusion still surrounds the notion of regional disparity in Québec. Problem sources include : the identification of regions, the measuring of regional welfare, and the lack of consideration for regional social structures. In particular, interpersonal monetary income disparities have to be jointly analyzed with interregional income disparities. Data from Revenue Canada, for the years 1966 and 1974, show stability in the interpersonal distribution and decrease in the interregional distribution. The analysis concludes with a critical evaluation of the social role of spatially oriented governmental institutions.