Over the 1980s unions have lost about 5 million members in OECD
countries. The proportion of unionized workers is increasing in the
services, public sector and among women. Today, almost two out of five
union members are employed in the public sector. Wide differences remain
in the levels of unionization in diverse countries, while in the United
States, France and Spain union members account now for little more than
10% of the labour force, in the Nordic countries (Sweden, Finland and
Denmark) the corre'sponding figure is between 75 and 85%. In general,
rates have been higher in Europe than in North America. Economic
analysis is paying increasing attention to these developments and to
their policy implications (Edwards, Caronna and Todling, OCDE 1991).
Recent progress in economic theory has enabled some light to be cast on
the determinants of unionism, on the other hand, efforts aimed at coming
to grips with the economic reality of unions have significantly
contributed to theoretical advancement by extending and modifying
conventional microeconomic wisdom. The reader of this volume will judge
whether the insight gained is sufficient, or - as a recent survey
concluded the problem has proved to be virtually intractable (Johnson,
p. 24). These can be grouped under three headings, corresponding to the
three parts of the volume, which will be illustrated in the
Introduction.