Shortly thereafter, the city of Amsterdam ordered the construction of an exchange in Dam Square. It opened in 1611 for business, and various sections of the building were marked for commodity trading and VOC securities. A bye-law on trade in the city dictated that trade could only take place in the exchange on weekdays from 11 a.m. to noon. While only a short amount of time for trading inside the building, the window created a flurry of investors that in turn made it easier for buyers to find sellers and vice versa. Thus, the building of the stock exchange led to a vast expansion of liquidity in the marketplace. In addition, trading was continued in other buildings, outside of the trading hours of the exchange, such as the trading clubs, and was not prohibited in hours outside of those outlined in the bye-law.