A collectible comic book is like a financial investment. It is also a potentially volatile financial strategy. There is no stock market or index to track the value of comic book collectibles. However, if you know which comics to invest in, and specifically which ones historically maintain their market value, then it can be a worthwhile investment.
Key comics, issues of vital and historical importance to collectors and fans, and rare comics with variant covers, are highly valuable and rare. Still, you have to know what you are looking for. You can add collectible comics to a financial portfolio in the same way you invest in a painting, car, real estate, or business.
