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