Explanation:
This is because the stock is focused on one company, which is likely to fluctuate in value depending on various circumstances (eg: its quarterly profit or its competition). Unless you have detailed knowledge of the company, then it's really anyone's guess as to whether its stock price will rise and fall. Of course we can make educated guesses, but ultimately it's fairly random what goes on.
Of this group, stocks are the riskiest choice to make due to the higher volatility. On the opposite side of the risk spectrum are government bonds. These are the safest choice offering a more guaranteed return. The catch is that the rate of return is smaller compared to stocks. Refer to the saying "the higher the risk, the higher the reward". Mutual funds and hedge funds are somewhere in between stocks and bonds.
