Active enterprises on the Italian territory extracted from the Asia Statistical Register (Business register) for each year t (frozen files). Given three successive populations of active enterprises, Nt, Nt-1 and Nt-2, the Entries are identified in year t (Et) comparing the population Nt with that of the previous year (t-1) and two years earlier ( t-2) (exact matching for identification codes). The Entries are, therefore, the active enterprises at time t and not active in t-1 and in t-2. The Exits (Ut) are identified by the three populations of active enterprises, Nt, Nt + 1 and Nt + 2. Exits are active
enterprises at time t not active in both t + 1 and t + 2. The comparison with the population relative to two years later excludes enterprises that can be reactivated.
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