Some joke bitterly that with a roll of toilet paper costing about 30,000 Zimbabwean dollars, it would be cheaper to stack 100-dollar bills in their bathrooms.Muza earns 2.5 million Zimbabwean dollars a month teaching, and about half goes to the rent, groceries and other expenses of his "small house.it is very difficult, Muza said softly, his voice trailing off.Changing BehaviorWith rich reddish