This paper presents a surprising example. It shows that lattice theoretic properties in Mas-Colell's (1986) seminal work are relevant to the existence of equilibrium problem even when commodity space is finite dimensional. The paper provides an example of an economy with three commodities and...

This paper considers sequential auctions where an individual's value for a bundle of objects is either greater than the sum of the values for the objects separately (positive synergy) or less than the sum (negative synergy). The authors show that the existence of positive synergies implies...