Book Review: The Politics of Urban Change by DAVID H. McKAY and ANDREW W. Cox. London: Croom Helm Ltd. 1979. pp. 297. £11.50 H/B; £5.50 P/B Marxism and the Metropolis: New Perspectives in Urban Political Economy edited by WILLIAM K. TABB and LARRY SAWERS. New York: Oxford University Press. 1978. pp. 376. £4.25