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Joined March 2019
Sometimes economics can be tricky to understand if it is not given with examples and probably that is why you did not get it. For example, if the required unit reserve ratio is 20%, the deposit multiplier ratio is (1/0.20) = 5x.
When a customer borrows from bank and spends all of the money, Similarly, when banks lend out all money to you- no one has any money, Neither the bank nor you, and that is why they are in unity. From the above equation an bank needs 100% reserve ratio and 1/100% =1x.
Reserve ratio is 100% because the reserves are zero in a bank and it needs to fill it back to the required level, say, 40% level of ready cash must be there in reserves. I’ll inform you if I find any abetter examples in professional resources