
The concepts of ‘commodity’ and of ‘simple commodity production’ in the work of Marx and his interpreters are examined as a necessary departure point for the analysis of value and price in a Mexican peasant‐artisan stoneworking industry. The labour theory of value, which posits a close relationship between market price and average embodied labour cost of commodities in a peasant‐artisan economy, is applied to the stone‐working industry and is shown to have explanatory power in both the qualitative and quantitative sense. This analysis leads to the conclusion that the labour theory is a necessary tool for discerning and approximating the fundamental role of the labour process, as well as the structure of production relations, in determining the nature and conduct of exchange activities in a peasant‐artisan commodity/market economy.