The thesis; the post-war youth labour market in Britain; the survey - early school leavers, 1979-81; jobs, apprenticeships and wages; young people and promotion - a mutual dependency analysis; the free rider problem - a new theory of trade union membership; trade unions - an empirical account; young people and instability; the end of the 1979-81 survey - themes and patterns; the youth labour market in Britain at the end of the century; jobs, unions and stability patterns at the end of the century; what is the youth labour market? Conclusions and policy implications.