What am I?

Cover the clues so you can only see number one. How many clues do you need before you know the answer?

1. I come in different shapes and sizes but I am used for the same reason all over the world.
2. I was once very important to the people of Nigeria.
3. Each one of me was the same.
4. The more a person had the better.
5. The more a person had, the more he or she could buy.

Answer in next week's TreasureLink.