In "Stocks and Bonds" (season five, episode 194), Beaver and Wally take an interest in investing, and Ward decides to let them give it a try and learn about the market firsthand by making an actual investment. What's interesting about this episode is that investors today face many of the same problems Wally and the Beav did more than 40 years ago.
In the episode, Ward steers Beaver and Wally toward a dividend-paying company, Mayfield Power and Light. If that doesn't sound like a nice, safe, and absolutely boring investment, I don't know what does. But the boys are simultaneously tempted by their friend Eddie Haskell to invest in Jet Electro, a company that builds rockets.