Hello,
Here is your answer:
The proper answer to this question is "with cattle".
Here is how:
Cattle back in the day could of been sold for a high price so they have the same price to the cattle which means they add the number of cattle they have and the prices therefore have the amount of money they have its like a bank.
Your answer is by using cattle!
If you need anymore help feel free to ask me!
Hope this helps!