And how would Scrooge stay in business?
Remember, he's paying 2% interest on every dollar in his Money Bin. But since it's just sitting there in the bin, it's earning zero him nothing. Every year, he loses 2% of his money (and no longer has 100% reserves, unless he pours money in from his own pocket).
Under a one-hundred percent reserve system, banks could only loan their own paid-in-capital, and they would have to charge people fees to store their money, much like a warehouse similar to public storage does. They could also issue certificates of deposit whereby it is clear to the customer that their principal is gone momentarily, and at-risk. A demand-deposit system should not be dependent on a logical impossibility, that is, paying every depositor should they all wish to have their money at the same time. Fractional Reserve banking is inflationary, and inherently unstable and should be abolished. We would be far better off paying to have our money stored than to have bankers making bad or corrupt loans which lead to malinvestment and economic depression.