Matching Pairs Money and business 1Online version Unit 4 Social Science 5 by M. Jesús Sciences 1 Now credit cards are... 2 Money is... 3 We use money to... 4 Camels, shells and grain... 5 Banknotes were invented... buy and sell products. any object that has value. often used instead of money. about 1300 years ago in China. were once used as money.