The reallocation of resources, either across sectors or across produce
rs within a sector, can serve as a potential source of productivity gr
owth. New research findings exploit comprehensive microeconomic data o
n the manufacturing sectors of Chile, Colombia, and Morocco to documen
t resource shifts as producers enter, expand contract, and exit operat
ion. The micro-level adjustment is substantial; between 25 and 30 perc
ent of the total number of manufacturing jobs turn over each year. In
the short run, the productivity effects of this turnover are modest be
cause the new plants that come on line are only slightly more producti
ve than the ones they replace-and both are typically small. In the lon
ger term, however, the turnover generates more substantial increases i
n productivity because the new firms that survive record substantial p
roductivity gains in their early years. Moreover, firms that exit are
typically on a downward productivity spiral and would probably have dr
agged down sectoral efficiency farther if they had continued in operat
ion.