I found the article that is from, for anyone interested in the whole thing:
It looks as if these excess reserves at the central bank must be crowding out teh lending? Excess reserves + loans = deposits. Wrong. This is all double entry accounting.
When teh central bank decides to purchase assets in the private sector, not only are new deposits created, but so are new reserves. New deposits (liabilities) must have corresponding assets. So when a bank creates a deposit through lending to a borrower, that corresponding asset is the loan. When the central bank creates these deposits through asset purchases, the parallel asset is the increase in reserves, which are also created. Under this scenario, it doesn't matter how much a bank lends, if the central bank continues to create new reserves and deposits through purchasing assets from the private sector, deposits will constantly surpass loans by the amount of these new reserves.
Therefore, banks do not and cannot lend out reserves or deposits, nor do excess reserves have a crowding out effect. The positive interest rates on these excess reserves occur because the banking system is being forced to hold said reserves and pay the related fees for the deposits.
Banks Don't Lend Out Reserves - Forbes
It is a really great explanation of why excess reserves are so high. But the second part about about buying assets creating more reserves confuses me. When an asset is bought, the result is a decrease in equity. Why would the Fed also have to increase bank reserves? For example, if the Fed buys a $1000 asset, the equity would decrease by $1000 and everything balances. I do not understand why we can assume that when the Fed buys a $1000 asset, it also creates $1000 more in reserves for the banks.
Everything else in the article seems spot on, so I think I may be missing something here. Or maybe the article was unclear. For if the Fed buys assets, the result will be more deposits. This will also decrease excess reserves, which all else remaining equal decrease when deposits increase. The total volume of reserves will not actually change of course. For example, Say there are $3,000 in reserves and $10,000in deposits. The reserve ratio is 10%. Required reserves would be .10 x 10,000, which is $1000. Therefore, there are $3,000 - 1000 in excess reserves, which is $2000 in excess reserves.
Now say the Fed buys a $1,000 asset from an investor. We then have this: $3,000 in reserves and $11,000 in deposits. The volume of reserves is the same, but excess reserves would be less. The required reserves for $11,000 is $1100. Thus the excess is now $3000 - 1100, which is $1900 in excess reserves. So why would we assume the Fed is not only buying assets but increasing the volume of reserves at the same time? That runs contrary to its goal in reducing the excess.
A more logical reason is that the deposit-destroying effect of calling in loans and not creating new ones is counteracting the deposit-creating effect of QE. Banks simply are not creating more loans. In the above scenario, even with the QE decreasing the excess by $100, banks may have just called in a $100 loan. With no corresponding new loan, the deposits would fall by $100. Excess reserves would once again be $2000, despite QE.
In short, QE does not create more reserves in volume, and has the effect of reducing excess reserves all else remaining equal. All else is not equal, however, and if banks are not creating money through lending, but closing deposits by calling in loans, then QE will fail because the lack of lending has the precise opposite effect.
But the second part about about buying assets creating more reserves confuses me. When an asset is bought, the result is a decrease in equity. Why would the Fed also have to increase bank reserves?
When the Fed buys an asset, how do they pay for it?
They credit the sellers reserve account at the Fed.
They buy $1000 in bonds, add $1000 to the reserve account.