As for the technology-driven Nasdaq Composite, it's lost more than a quarter of its value in under seven months, which places it in a bear market. While there's no question that big declines in the stock market can be unnerving, history has repeatedly shown that these dips are the ideal time for long-term investors to pounce. The first unique company that can help long-term investors build generational wealth over the next two decades is e-commerce platform Etsy (NASDAQ: ETSY).