This paper extends my previous analysis of the causal relationship of GDP a
nd energy use in the USA in the post-war period. A majority of the relevant
variables are integrated justifying a cointegration analysis. The results
show that cointegration does occur and that energy input cannot be excluded
from the cointegration space. The results are plausible in terms of macroe
conomic dynamics. The results are similar to my previous Granger causality
results and contradict claims in the literature (based on bivariate models)
that there is no cointegration between energy and output. (C) 2000 Elsevie
r Science B.V. All rights reserved. JEL classification: Q41.