Final answer:
Option 4 supports the idea that stock market investments do not always pay off because changes in stock prices can occur due to various factors.
Step-by-step explanation:
The answer that supports the idea that stock market investments do not always pay off is option 4: The inherent risk of the stock market is that any number of forces — logical or otherwise — can push prices up or down. This option explains that stock prices are influenced by various unpredictable factors, which means that investing in the stock market can result in losses as well as gains.
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