Which of the following is a potential risk involved in investing?

Market risk refers to the potential for loss due to fluctuations in the market prices of securities. It is a fundamental concept in investing because it encompasses a range of factors, including changes in economic conditions, interest rates, and investor sentiment that can affect the value of investments. When you invest in stocks, bonds, or other assets, the performance of those investments can be impacted by broader market trends, leading to potential gains or losses.

This risk is inherent to nearly all types of investments; therefore, understanding it is crucial for any investor. Recognizing that market risk exists helps investors make informed decisions, create diversified portfolios, and develop strategies to mitigate that risk.

In contrast, the other options do not accurately represent typical investment risks. Fixed rate risk, while relevant in certain contexts like bonds, does not cover the broader spectrum of exposure to market fluctuations. Liquidity guarantee is not a recognized risk but rather a feature some investments may offer. Investor insurance risk does not typically apply in the context of investing risks as outlined here, as it's more related to financial products like insurance rather than the investment mechanism itself.