To the extent that their labour produces value and surplus value, teachers are productive labourers. This paper discusses teachers' labour in relation to the production of new labour power, explores the extent to which it is alienated, and explains how it produces surplus value. But the classroom is also a site of struggle. The paper explores some of the ways in which teachers and students may both refuse capitalist work and create space in order to pursue alternative projects that better meet their own needs. To this extent, teachers and students are productive, not of value, but of struggle.