This paper considers the causes of post-war UK business cycles. Using
an extended stochastic growth model we construct estimates of producti
vity and preference shock; both of which are highly persistent, volati
le and potentially capable of explaining UK business cycles. We find t
he productivity term is the dominant explanation of UK output fluctuat
ions but our estimated preference shift is crucial in understanding em
ployment movements. A variety of Granger causality tests establish whe
ther these productivity and preference terms are unpredictable and so
can be potentially considered as the cause of UK business cycles or wh
ether they are themselves Granger caused by other variables.