This document presents a case study on Marriott Corporation and estimating its weighted average cost of capital (WACC) for 1988. It provides background on Marriott, outlines the objectives and methodology, lists assumptions, and shows the results of estimating WACC for Marriott's lodging, restaurant, and services divisions as well as for the overall company. WACC was highest for restaurants at 11.05% and lowest for services at 5.74%, with the overall company WACC estimated at 8.04%. The conclusions discuss lessons on WACC estimation and how capital structure affects cost of capital.