Final answer:
In the context of common stock, preferred stock, and bonds, common stock typically offers the highest expected return, balancing the increased risk with the potential for greater rewards.
Step-by-step explanation:
When looking at common stock, preferred stock, and bonds, it is important to understand that there is a tradeoff between expected return and risk. Over a sustained period of time, common stocks have been observed to have a higher average return compared to bonds, which in turn offer higher returns than savings accounts. This is due to the fact that with higher risk comes the potential for higher returns, as investors must be compensated for taking on additional risk. For instance, the value of common stocks can significantly fluctuate, as seen with the S&P 500's notable rise and fall in consecutive years 2009 and 2008. Bonds, depending on interest rate changes, have less severe fluctuations in value, but still more than a savings account.
Therefore, the investment with the highest expected return, on average, is common stock. It's crucial to note, however, that this higher expected return comes with a higher risk, and returns can be quite volatile year to year.