Abu was a Neolithic farmer. He needed a new grinding stone, so he traded sheep with a local craftsman who made the tool. See all stories on: http://www.goexplore.net/future-tech/payments-evolution-sheep-to-smartphones/

1. Theevolutionofpayments
fromsheeptosmartphones
Sheep:9,000–6,000BC
Coins:700BC
Receipts:600AD
Cheques:1659AD
CreditCards:1952AD
InternetShopping:1994AD
ATM’s:1967AD
VirtualCurrency:1996AD
TextMessages:1997AD
Contactless:2005AD
BANKING PAYMENT PROTECTION
OnlineTransactions:2015AD
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