Investing in collectibles can be volatile and incredibly enriching if you have the right trading card, comic book or action figure in mint condition. The rise and fall of the Beanie Baby investment bubble from the mid-90s into the early 2000s is an example of what can happen when you follow a trend too closely. There were even organized Beanie Baby theft rings.
There is risk in most investments except U.S. Savings bonds and U.S. Treasuries. Investing in stocks is risky but the risks can be measured and reflected in the price as the market can adjust quickly and absorb changing conditions.
