These days, however, the Cheshire cat has totally disappeared together with
the grin. In Mas-Colell, Whinston & Green authoritative _Microeconomic
Theory_, there is no entry for "Labor" in the Index between "Kuhn-Tucker
conditions" and "Lagrange multipliers". G�ter jeden Ordnung (Menger) or
Gegenst�nde der dritten Klasse (Gossen 1854, p. 26, 1983 Blitz trans p. 31,
cf Aristotle Pol. 1254a1-4) are now dimensions of the Euclidean commodity
space.
Nicholas J. Theocarakis