Richard D. Wolff

I'm still somewhat confused. For example, I spend 3 days a week, every summer, playing music in a restaurant for 20 an hour. So as I understand it, I've entered a contract in which I sell my labour power to an employer. The employer "consumes" the purchased labor power by setting me- the worker - to perform the laboring activity (play the piano) alongside/with tools, equipment, and raw materials (a piano). Does surplus value exists in this case? Is there a distinction between the surplus value of labour power producing intangible services vs. labour power producing tangible product and how can it be measured? How is this purchase of labour power different from that of a capitalist? And lastly, would there be a necessary change in such purchase of labour power in an alternative mode of production, ei a worker coop? Original question: http://www.rdwolff.com/johnlock/can_you_explain_the_difference_between_labour_and_labour_power?recruiter_id=82586