The traders would buy or sell shares based on what they heard over the phone, a practice known as "front running."

That news was enough to send traders to sell the dollar.

As economists, we know that traders cannot sell above the price offered.

This is because the trader can sell stock needed to hedge the long call at a higher price.

People in the futures market took the job data at face value, traders said, and sold throughout the session.

"Thus, traders could buy power at $250 and sell it for $1,200," according to one memo.

As each report hit the market, traders either bought or sold, depending on the mood of the moment.

Traders could not sell a ruined face full of scars.

"Given the weak bond markets of the past few days, many traders had been selling short."

In market making, traders will buy and sell financial products with the goal of making money on each trade.