weehawken, see caucus, carterrette, and -- in new jersey, and you go in them, which what you see is rows and rows of black boxes. one set of the black boxes if the exchange itself, called the matching engine. where buyers and sellers are connected. where price of the stock should be because of the buyer and the seller agrees to meet at that price. then you have around that matching engine the boxes of the high-frequency traders who pay $50,000 a month, $100,000 a month, whatever it is to connect a line directly into the box to get information about what is happening on the exchange before everybody else. >> host: what is front running you talk about in "flash boys"? >> guest: front running is -- the idea is almost like tickets. imagine a ticket and a scalper. one who figures out the show will be sold out, runs out, buys a ticket at the box office price and sells them at doubling the price to people who walked up to see the show. in the stock market, what is happening often is that traders with faster machines are able to anticipate orders to buy and sell stock from investors, and every k