Three previously independent sk markets became, in effect, a single market. If a security was listed on more than one exchange, potential buyers and sellers could choose the exchange on which to execute a trade in this security. This book closely analyzes this competition. The NYSE emerged as the winner of this competition. It became the place to trade securities that evoked regional and eventually national interest, while the Boston and Philadelphia exchanges remained regional exchanges. This book explores when and whythis happened. This analysis is applied to the competition between (i) sk exchanges today; (ii) taxi ride-booking services such as Uber and Ola; (iii) restaurant to home, food delivery services, such a Zomato and Swiggy; and (iv) doorstep delivery services, such as Blinkit and Zepto.