trade

give one thing for another
commece
barter
swap

The Indian traded blankets for a horse.

We trade money (coins) for goods and services.

Countries trade with one another.

http://education-portal.com/academy/lesson/gains-from-trade-and-the-benefit-of-specialization.html

http://en.wikipedia.org/wiki/Trade


Trade Routes
http://www.public.iastate.edu/~cfford/342WorldHistoryModern.html

http://www.asparis.net/lowerschool/5thgrade/rome/dalton.org/Rome%20Map%20of%20Trade%20Routes.htm