R. W. Davies 
From Tsarism to the New Economic Policy [PDF ebook] 
Continuity and Change in the Economy of the U. S. S. R.

A comparison between the tsarist economy on the eve of the revolution and the Soviet economy in the mid-1920s. Questions posed include, was the tsarist economy successful, but destroyed by World War I? And was the breakdown of the mixed economy of the 1920s an arbitary political act?