Excerpt from Optimal Consumption and Portfolio Rules With Durability and Habit Formation We entertain three different economic ideas in three different interpretations of the model specified in and In one interpretation, preferences given by (1) exhibit the notions of local substitution and habit formation. Agents with such preferences treat consumptions at adjacent dates as close substitutes and consumptions at distant dates as complements. In a second interpretation, the model represents habit forming preferences over the service flows from irreversible purchases of a durable good that decays over time. In the third interpretation, the model represents preferences for consumption of a dual purpose commodity that provides the agent with two sources of utility. The two components of such a composite good, however, have different half - lives. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.