This paper explores the impact of turnover and restructuring on labour productivity in the Polish economy over the period [1988][1989][1990][1991][1992][1993]. Changes in aggregate productivity are decomposed into elements corresponding to productivity growth among survivors, market share growth by survivors and the contributions of entering and exiting firms. The traditional entry and exit effects begin to work as transition to a market economy progresses. However, initial productivity improvements are due to changes to market shares of the existing firms following the break-up of large enterprises. Regression analysis shows that changes in the firm-level productivity are affected by restructuring and a more competitive economic environment.1