The study examines, what forms and instruments firms use to react flexibly to demand-
induced output fluctuations, and, if they are used in a complementary or substitutable
way. Empirical evidence shows a rather complementary relationship. Moreover,
the determinants of temporary employment (fixed-term contracts and temporary
agency work) and the impact of these flexible employment forms on job security and
job stability of regular employment are analyzed. One result is that positive developments
of sales covary with a higher probability and more wide-spread use of temporary
employment, which concurs with dual labour market theory. But estimations for
job security and job stability indicate that temporary employment does not lower the
number of layoffs and quits as is proposed by the core-periphery hypothesis.