There are a lot of misconceptions about banking in general. Exemplary I will comment some of the inaccuracies in the following post (which nevertheless is one of the best contributions in this thread).
From what I understand of fractional reserve, the banks are obliged to keep a percentage of deposits in reserve while the remainder can be loaned out to other people,
This is only partially correct, because in most cases there is no cash deposit involved. A more correct formulation is that "the bank must own X% (the reserve rate) of
central bank money* - which can be cash or a loan from the central bank - for each dollar/euro/whatever existing in the bank's accounts".
To show the difference: Often people create an account at a bank and transfer money from another bank account to it. To "back" this money according to the fractional reserve rate, the bank must then acquire X% of central bank money - but only if there is not an equivalent movement of funds to another bank.
Often these movements all "equilibrate" themselves because there are much more transfers between bank accounts than cash withdrawals.
Now to loans: a loan doesn't mean that the bank "gives out cash" to someone, but it credits the required amount to an account in the same bank. This again means that the bank must acquire central bank money of X% of the loan - again, if there are transfers to other banks for the same amount, there is no need for it.
After the amount is credited to the customer's account, several things can happen:
1) The borrower can use the money to pay someone who has money at the same bank. This means that once the bank has ensured it owns the central bank money to "back" the loan, no more central bank money is needed.
2) The borrower pays someone who has money at another bank. This case is the most frequent one. This means that the bank actually can reduce the reserves (if there are no transfers for the same amount towards the bank) but its liquidity is reduced.
3) The borrower extracts the money as cash. This is relatively uncommon. In this case, the bank has to acquire again, more central bank money, as the cash amount reduces the bank's reserves.
In a situation where depositors withdraw more money than was kept in reserve, the banks would be forced to sell loans at a loss to other banks to raise money, this would not involve tax payers money.
There can be two different situations:
- If users "withdraw cash", they need more central bank money. What they would normally do is to increase their deposits at the central bank (=take another loan from the central bank).
- But if customers withdraw money to another banks, then the banks will have, once the transfer is cleared, actually less liabilities, and can decrease their holdings on central bank accounts. But they have also reduced their liquidity.
This could be one of the last cards the banks have to play inorder to salvage the economy, while putting them at high risk. So I would say, Yes, zero reserve policy is scary.
The author of the blog post - while not an economist, it seems - is correct: in March 2020 the fractional reserve system was abolished in the US by the Fed in its current form.
Is it scary? Well, at a first glance it might seem that yes - but I read that banks in the US, before the abolition of the mandatory reserve, actually owned an excess of trillions of dollars of central bank money. The Fed is paying interests for these reserves, and thus it gives incentives to banks to "park" money at the central bank. It seems that this is at least as effective than simply requiring 10%, or 3% (for smaller banks). So they may have thought that the minimum fractional reserve is no longer needed.
In Europe, for decades now, the required fractional reserve is as low as 1%. This doesn't limit, practically, loans given out by banks, and also in the Eurozone banks actually banks own much more central bank money than required by the ECB fractional reserve policy.
*Most of the time there is more "central bank money" deposited on the banks' accounts at the central bank, than the amount of cash they have available. To obtain these central bank loans the banks deposit securities and other assets, like bonds or stocks, at the central bank.