5.1 In an Edgeworth box economy, do the following:

(a) Sketch a situation where preferences are neither convex nor strictly monotonic and there is no

Walrasian equilibrium.

(b) Sketch a situation where preferences are neither convex nor strictly monotonic yet a Walrasian

equilibrium exists nonetheless.

(c) Repeat parts (a) and (b), but this time assume preferences are not continuous.