Final answer:
The tradeoff agents make when deciding to save or invest involves balancing return and risk.
Step-by-step explanation:
The tradeoff that agents make when deciding to save or invest is balancing return and risk. When agents save, they typically choose low-risk options such as bank accounts or bonds, which offer lower returns. On the other hand, investing involves taking on more risk in exchange for a potentially higher return. For example, investing in stocks or real estate can offer higher returns, but they also come with a higher risk of losing money.