My fellow researcher, the shopkeeper down the street. He operates an ink n paper blockchain ledger for his pre-qualified customers. The ledger is entered and scratched, in sequence, each of the customers remember their last entry.
No space left unfilled after your name, then the page is done, you get a new page. The man is running a virtual savings and loan, he adjusts prices to maximize the quantity of entries while pricing the cost of defaults.
His cash customers save about 1% on ATM fees, his Chip card customers save about a half point. Total expense? One dollar per notebook, and personal contracts. os of us have a similar generator, we are ad hoc buyers a bicycle basket at a time.
What happens when the shopkeeper and customers have the same intelligent cash cards? Then he puts his blue notebook into a javascript app, and we agree to his contract. From then on everything is the same, if we need to see the blue book, he swivels his lap top and there it is, an exact duplicate. Great, we have dropped the transaction costs from a few dollars a year to a nickel a year.
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