Not only is it difficult to distinguish leisure from other non-work but
also even work from non-work. Is commuting work, non-work or both?
How about a business lunch, a good diet or relaxation? Indeed, the notion
of productive consumption was introduced precisely to cover those commodities that contribute to work as well as to consumption. Cannot pure work
then be considered simply as a limiting commodity of such joint commodities
in which the contribution to consumption was nil?