Dealing with the conspiracists
The oft-given explanation circulating around the internet is that banking originated from goldsmiths is misleading as it suggests that this was widespread when there may only have been the odd example of this. There is one film (Money As Debt) which gives the impression that every mediaeval and early capitalist town had goldsmiths who did this. Currency cranks use the goldsmith argument fairly extensively to show that a bank can lend more than has been deposited with it. It is also strange that this historical theory should be widespread in the US where there would ever have been any goldsmiths who did this (if only because the money-commodity there was silver to start with) and where paper money originated from the states printing it and making it legal tender for paying taxes.
Adam Smith makes no mention of "goldsmith bankers". His description of how the Bank of Amsterdam operated confirms that the currency cranks have not been able to produce any example of a bank that issued more certificates of receipts than the gold it had (and survived). Only a state or state-guaranteed bank can issue "fiat" money as money not backed by anything.
It would be much more likely that banking originated from moneylending, which would have been more widespread, when people with money to lend began issuing trade bills to factory owners and merchants to cover the period between production and sales. And if they started issuing more bills than they could honour (as goldsmiths are supposed to have done) they'd go bankrupt fairly quickly.
There were some goldsmith-bankers in London in the 17th century (but not in every town). Here's an example of how the currency cranks interpret what they say happened:
But the goldsmith-bankers seem rather to have been more like pawnbrokers for the idle rich according to this article.
A contemporary account of how goldsmith bankers actually operated can be in Richard Cantillon's "Essai sur la nature du Commerce en General" (it's in English) written in 1730. Here's what he wrote:
"If a hundred economical gentlemen or proprietors of land, who put by every year money from their savings to buy land on occasion, deposit each one 10,000 ounces of silver with a goldsmith or banker in London, to avoid the trouble of keeping this money in their houses and the thefts which might be made of it, they will take from them notes payable on demand. Often they will leave their money there a long time, and even when they have made some purchase they will give notice to the banker some time in advance to have their money ready when the formalities and legal documents are complete. In these circumstances the banker will often be able to lend 90,000 ounces of the 100,000 he owes throughout the year and will only need to keep in hand 10,000 ounces to meet all the withdrawals. He has to do with wealthy and economical persons; as fast as one thousand ounces are demanded of him in one direction, a thousand are brought to him from another. It is enough as a rule for him to keep in hand the tenth part of his deposits. There have been examples and experiences of this in London. Instead of the individuals in question keeping in hand all the year round the greatest part of 100,000 ounces the custom of depositing it with a banker causes 90,000 ounces of the 100,000 to be put into circulation. This is primarily the idea one can form of the utility of banks of this sort. The bankers or goldsmiths contribute to accelerate the circulation of money. They lend it out at interest at their own risk and peril, and yet they are or ought to be always ready to cash their notes when desired on demand. If an individual has 1000 ounces to pay to another he will give him in payment the banker's note for that amount. This other will perhaps not go and demand the money of the banker. He will keep the note and give it on occasion to a third person in payment, and this note may pass through
several hands in large payments without any one going for a long time to demand the money from the banker. It will be only some one who has not complete confidence or has several small sums to pay who will demand the amount of it. In this first example the cash of a banker is only the tenth part of his trade."
Nothing here about the goldsmith banker being able (or even trying) to lend more than the 100,000 ounces of silver deposited with them, as in the fairy tales of the currency cranks.
Cantillon's full account of how the banks of his time operated can be found in Chapter VI


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