This trading is not idle gambling. Those who have been kind enough to lend money to the world's governments, companies and households may wish to reduce their substantial risks. That's a noticeable profit or loss, and the holder of the bond might want to hedge some of that risk. Hence financial markets. The trading floor is quiet, waiting.
Eyes are on the screens, waiting for the print.
So we wait attentively for this periodic news. And they're off. This chorus comes from the futures trading floor. But face to face trading is coming to an end. In 67 BC, the market in play was grain.