Investment performance is the return on an investment portfolio, [1] which can contain a single asset or multiple assets.
A single-asset investor will only hold one kind of stock, unlike multiple asset investors. The single-investor fund structure often is investor run. Single-investor funds often are requested, or even required, by investors seeking a kind of structure. [2]
Multi-asset class investments increase the diversification of an overall portfolio by having multiple investments throughout different classes, reducing risks like volatility. A multi-asset class investor might hold stocks, bonds, cash, and real property. [3]
Bruce J. Feibel. Investment Performance Measurement. New York: Wiley, 2003. ISBN 0-471-26849-6