8
Third, the customary estimation of net employment growth conceals the separate processes of
job creation and destruction. Plants of all sizes incur both job gains and job losses. Some idea of these
dynamics is given in Table 1.5. The data paint a picture of the concentration of gross job gains and losses
in very small and small establishments. Establishments employing fewer than 20 workers seem to
account for between 45 and 65 per cent of new job gains and 36 and 56 per cent of annual job losses (the
data for the United States are much lower, partly because firms employing fewer than five workers are
excluded and partly because they refer only to manufacturing and exclude services).
Fourth, recent research in the United States has pointed to age-related patterns in job creation:
one is that net job creation rates decline with plant age; the other is that employment volatility declines
with plant age. These patterns should not come unexpected, given that young firms are nearly always
small. However, small firms are not necessarily young. The distinction is important because, if age rather
than size was the criterion, policy should focus less on small firms and more on young firms. Put
differently, a policy in favour of SMEs would be replaced by a policy to promote entrepreneurship, for
example, through the removal of regulatory barriers to firm creation. Yet, more empirical evidence on the
significance of age as opposed to size is needed before clear policy conclusions can be put forward.
Information on job creation and destruction reveals a considerable amount of churning in all
labour markets. Annual job turnover rates — the sum of newly created jobs and jobs that have disappeared
— are of the order of 20 per cent per year in countries as diverse as France, Sweden and the United States.
Job turnover is a critical part of the competitive process, contributing to economic growth, productivity
and structural change. Excessive turnover, on the other hand, can deter businesses and workers from
investing optimally in training. A relative lack of skills can affect the ability of firms to adapt to change
via internal flexibility as opposed to external adjustment. Permanent job losses can lead to substantial
cuts in income for those affected as their accumulated firm-specific skills lose their value. Finally, when
turnover is associated with large-scale lay-offs or plant closures, substantial costs may be borne by regions
and communities.
The costs of churning have to be weighed against the positive effects of turbulence, such as
entrepreneurship and the search for new processes and products. As reported in OECD (1996),
Technology, Productivity and Job Creation, less than one-half of SME start-ups survive for five years;
only a small percentage of surviving SMEs turn into high-growth firms; and these high-growth firms
make important contributions to job creation and productivity growth. At the firm level, turnover could
be the result of a process of trial and error, with some enterprises failing almost from the start, some being
limited to the life span of a single innovation, and others enjoying sustained success.
Export, production and productivity
Overall, SMEs account for between 30 and 70 per cent of value added (Table 1.6) with
variations between countries and industries. Also, as would be expected, the likelihood that output is
exported is smaller for SMEs than for large enterprises: in very general terms and depending on the
country, SMEs contribute between 15 and 50 per cent of exports, while between 20 and 80 per cent of
SMEs are active exporters. Overall, it is estimated that SMEs contribute between 25 and 35 per cent of
world manufactured direct exports (OECD, 1997, Globalisation and Small and Medium Enterprises).
Where information exists, it points to these exports being concentrated around relatively few larger SMEs.
However, most of the growth of exports seems to be taking place in smaller SMEs.
The employment share of SMEs exceeds their share in value added, implying that value added
per employed person (a measure of labour productivity) is lower in smaller firms than in larger ones. Yet
it would be misleading to conclude from this observation that small firms necessarily contribute less than