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They didn't use money, but their slaves did.
Yes, people in Sudan do use money. The currency of Sudan is the Sudanese Pound.
The people of Cote d'Ivoire use West African CFA franc as money
A money substitute is something people can use instead of money.
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to spend it
People who use it
I don't think it would be in bad taste to ask for money. In this day and age it's better that people use their money wisely, and buying a useless gift would be a waste. Just let people know you'd like to use the money for your new home and all should be fine.
They use some of it on welfare for people who don't have enough money.
No
Other legos. Nothing is better than trading the parts of other lego people as currency.
Yes, they are if you are tight on money. Prepaid phones do help people who want to use a specific feature more than the other. You only get charged for what you use.