When you bring money to a bank, that money is treated as both a liability (to you) and also as collateral against which the bank can lend money to others.
When a bank lends money to you, it's net neutral. A $100,000 mortgage creates a -$100,000 position on the bank's liabilities list and a $100,000 deposit in your bank account. They create $100K in new money to fund this loan collateralized by both the reserves on deposit at the bank and by the property which you purchased. As you repay that balance, the money that was created to fund your loan blinks out of existence. It is the constant origination of new loans and the constant repayment of old debt which defines the supply of money in the economy - which is why interest rates matter. Neat huh.
I would argue that your balance is both an asset and a liability as defined by your bank's reserve requirements. Your mortgage is net neutral to the bank except for the interest paid on it, which is an annuity of sorts with a net present value offset by the difference between projected recovery rates and your risk of default. The value there is itself created in the origination and underwriting process.
We'll I'll just ask two:
Suppose to buy my house the seller wants cash. I take out my cash and give it to the seller. Ok fine, but the bank is creating money out of thin air, where does the cash come from if lots of people do the same?
Follow up: more realistically, I wire money to the seller, what actually happens between the banks? It seems like bank A creates money from nothing and sends it to bank B, what is stopping bank A from sending out an infinite amount of money to other banks?
> where does the cash come from if lots of people do the same?
the cash comes from the gov't printing it. It's a mere fraction of all spendable money. Banks store some amount of it, just for such cases where you wish to withdraw it.
If everyone demands their deposit as cash, the bank would run out of physical notes very quickly. They would, in all likelihood, ask the central bank to print the cash (in exchange for the reserves they hold at the CB), in order to fulfill the withdrawal. This might take days, weeks even, depending on how many notes are to be printed. Note that this isn't printing new money - it's merely transforming digitally stored money into physical paper.
> I wire money to the seller
Bank A would have an account within Bank B, and vice versa. At the end of the day, these banks "settle" their accounts; aka, if there's more money in Account A (in Bank B), it means Bank A has sent more money to Bank B, and Bank B needs to owe Bank A. This is basically how international transfers work. For local banks, it's likely that the Central Bank would clear these transfers up (aka, Central Banks are the banks for banks).
> what is stopping bank A from sending out an infinite amount of money to other banks?
The same reason why a bank cannot just create infinite money and spend it on hookers and blow. They are creating money only via lending, and there are laws regarding how much they're allowed to lend out (called reserve requirements).
but you cannot create enough, because before you created, you did not have enough reserve to legally create the loan. The newly created loan cannot be part of the reserve to which you count towards your original reserve requirement to qualify to make the new loans!
otherwise, this would just be a loophole in the reserve requirement laws.
And these monies are not cash - they are loans. If these loans default, and the bank somehow cannot collect the collateral for it, the bank will lose equity. Aka, the shareholders of the bank takes the loss. If this loss is great enough, the bank becomes insolvent. That's why banks do not lend to risky people, or takes a larger collateral.
>A $100,000 mortgage creates a -$100,000 position on the bank's liabilities list
On a financial statement of a real, 120 year old bank on sec.gov, loans are in the asset section of the "Consolidated Statements of Condition". The deposits are in the liabilities section, and there are no negative numbers in either part.
>and a $100,000 deposit in your bank account.
Is that what happened the last time you applied for a mortgage?
When a bank lends money to you, it's net neutral. A $100,000 mortgage creates a -$100,000 position on the bank's liabilities list and a $100,000 deposit in your bank account. They create $100K in new money to fund this loan collateralized by both the reserves on deposit at the bank and by the property which you purchased. As you repay that balance, the money that was created to fund your loan blinks out of existence. It is the constant origination of new loans and the constant repayment of old debt which defines the supply of money in the economy - which is why interest rates matter. Neat huh.
I would argue that your balance is both an asset and a liability as defined by your bank's reserve requirements. Your mortgage is net neutral to the bank except for the interest paid on it, which is an annuity of sorts with a net present value offset by the difference between projected recovery rates and your risk of default. The value there is itself created in the origination and underwriting process.