That is a valid opinion, but it is not plucked out of thin air by the bank.
Transaction 1 bank gets 100, pus 20 in reserve and lends the 80 out, leaving the bank 20 in reserve, 100 in debt, and 80 in loan asset; 0 sum.
Transaction 2 bank gets 80, puts 16 in reserve with the 20 and lends 64 out, leaving the bank 36 in reserve, 180 in debt, and 144 in asset; again this is 0 sum, as is every step down the chain.
The end of all rounds (as decreed by the reserve requirement) is 500 in deposits, 400 in loans, and 100 in reserve; still 0 sum.
The bank cannot lend out that 100 in reserve or a portion of it as the reserve requirement ties it to the 400 already loaned out. Perhaps you are thinking of the banks reserve as cash in drawer it can do what it likes with? That is not the case, it can only put that cash back into circulation when the loan it is tied to is paid up. Ie, after first deposit bank has 100, it lends 40 out which leaves the bank with 50 cash on hand, and 10 in the reserve.
The initial 100 deposit is a loan service contract from an individual to the banks; in return for the bank holding the money securely and paying out a small amount of interest the bank gets to use the money itself to lend to another person. At that point in time (before first loan) they do hold that deposited money in reserve, and could pay it straight back if the depositor wanted to make that withdrawal. Nowhere in that process has the bank generated money out of thin air.
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