^ The concept of the bourse (or the exchange) was 'invented' in the medieval Low Countries (most notably in predominantly Dutch-speaking cities like Bruges and Antwerp) before the birth of formal stock exchanges in the 17th century. Until the early 1600s, a bourse was not exactly a stock exchange in its modern sense. With the founding of the Dutch East India Company (VOC) in 1602 and the rise of Dutch capital markets in the early 17th century, the 'old' bourse (a place to trade commodities, government and municipal bonds) found a new purpose – a formal exchange that specialize in creating and sustaining secondary markets in the securities (such as bonds and shares of stock) issued by corporations – or a stock exchange as we know it today.
According to one interpretation of the efficient-market hypothesis (EMH), only changes in fundamental factors, such as the outlook for margins, profits or dividends, ought to affect share prices beyond the short term, where random 'noise' in the system may prevail. The 'hard' efficient-market hypothesis does not explain the cause of events such as the crash in 1987, when the Dow Jones Industrial Average plummeted 22.6 percent—the largest-ever one-day fall in the United States.