80
Lesson 80 of 84 · Trade and Commerce
Major Trading Partners of the U.S.
Money has taken many forms: shells, beads, metal coins, paper bills, and now digital transactions. Paper money was invented in China around the 7th century.
Key Facts
1
Trade connects people globally.
2
Every choice has an opportunity cost.
3
Money is a medium of exchange.
Check Your Understanding
Question 1
1 of 2What is an opportunity cost?