This paper, unlike the previous studies dealing with Wagner's Law for
Mexico, applies the techniques of unit root testing and cointegration
to determine the presence of a long-run link between the share of gove
rnment expenditure in real GDP and veal GDP per capita in the Mexican
economy during the period 1950-1980. The empirical evidence presented
in the paper supports cointegration implying that low frequency moveme
nts in the real GDP per capita do explain the long-run swing in the sh
are of government expenditure in real GDP in the Mexican economy durin
g the period under consideration.