It's an unwritten agreement that my customers do not trade among themselves.

Transaction systems allow customers to trade currencies and equities electronically.

A friend who worked at the local game store started texting him cryptic photographs of something a customer had just traded in.

In the store's early days, customers would often trade eggs for groceries.

In line, customers traded rumors about what was coming next.

And Blockbuster is expanding programs that let customers trade both videos and video games.

This credit allows customers to trade while the cash settles.

Datek is a tiny player in options - its customers trade less than 5,000 contracts a day.

The shorter terms also mean customers can trade more often.

The new system will make it easier for brokers to let customers trade directly with each other, but there is no guarantee that will happen.