Consider a closed city in which all employment is at the city center. Suppose that the work week is shortened from five days a week to four days a week, but hours per day are adjusted so that output and income stay the same. Draw two residential rent gradients, one for the city with the five-day work week and one for the city with the four-day work week. Draw them on the same graph, and label them carefully so that one can be distinguished from the other.