This is explained in the following quotation.
"Tally sticks have no real sound value themselves and cannot become scarce. They're just a measure of the goods and services in the market. By collecting 18 tallies for 18 baskets you have kept your baskets private stable and you now have extra money to put in your straw mattress for a rainy day.
When you need extra tallies to build a larger house you borrow them from the accountant who tallies the debt when in accounting entry, you pay principal and interest on this loan by increasing your basket production in trading the additional baskets for additional tallies who pockets the interest. There's no shortage of tallies as they are pegged to the available goods and services. They multiply along with this real wealth, but they don't inflate beyond real wealth. This is because tallies and wealth goods and services are come into existence at the time when you are comfortable with your level of production, say 20 baskets a month."Source: The Web of Debt
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