This document discusses various asset classes for building a diversified investment portfolio, including cash, bonds, equities, and property. Each asset class has unique risk-return profiles, with cash generally offering lower returns, bonds varying by issuer risk, equities providing higher long-term returns but with greater risk, and property characterized by illiquidity and potential for rental income. It emphasizes the importance of adjusting asset mixes based on market conditions and investor sentiment while considering the role of professional managers in portfolio management.