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