In chapter eight of “Tuesdays with Morrie,” the main idea is that money cannot buy happiness or fulfillment in life. Morrie emphasizes that people should focus on relationships and experiences rather than material possessions. He also discusses the negative effects of society’s obsession with money and how it can lead to greed and selfishness. Morrie encourages the reader to find meaning and purpose in life beyond financial success and to prioritize the things that truly matter. Overall, the chapter teaches the importance of valuing relationships and experiences over material wealth.