Editing Edgeworth box (section)

===Terminology for offer curves===
Offer curves were first used by [[Vilfredo Pareto]] – see his ''Manuale''/''Manuel'' Chap. III, §97. He called them 'exchange curves' (''linee dei baratti''&nbsp;/&nbsp;''lignes des échanges''), and his name for Octavio's preferred allocation along a budget line was his 'equilibrium point'.

This preferred allocation is sometimes nowadays referred to as Octavio's 'demand', which constitutes an asymmetric description of a symmetric fact. An allocation determines Abby's holding as much as Octavio's, and is therefore as much a supply as a demand. 

''Offre'' is French for 'supply', so calling an offer curve a locus of demands amounts to calling a supply curve a locus of demands.