The first modern stock trading was created in Amsterdam when the Dutch East India Company was the first publicly traded company. To raise capital, the company decided to sell stock and pay dividends of the shares to investors. Then in 1611, the Amsterdam stock exchange was created. For many years, the only trading activity on the exchange was trading shares of the Dutch East India Company.
At this point, other countries began creating similar companies, and buying shares of stock was all the rage for investors. The excitement blinded most investors and they bought into any company that began available without investigating the organization. This resulted in financial instability, and eventually in 1720, investors became fearful and tried to sell all their shares in a hurry. No one was buying however, so the market crashed.
Another financial scandal followed in England shortly after— the South Sea Bubble. But even though the idea of a market crash concerned investors, they became accustomed to the idea of trading stocks.