This is a brief introduction to the nature of money and its relationship with accounting. It’s not comprehensive, but it’s a fun way to introduce accounting to a new audience: ice-breakers, introductory sessions, or school talks. It makes learners think more carefully about money and differently about accounting.
Accounting isn’t just about counting beans— it makes them too. It may be hard to believe, but real money is created with a nifty bit of double-entry bookkeeping. To understand how this works we need a close look at those beans—the money.
Banknotes and coins are money but physicality is not the defining feature of money. This is clear from the “invisible money” that we use every day hiding in our plastic cards, mobile phones and computers.
Invisible money is not a recent phenomenon. The history of civilisation is scattered with examples of economies flourishing without physical money. For example, the Pacific island of Yap, which was largely isolated from the rest of the world until the late nineteenth century, used giant immovable “fei” stones to support a credit economy. John Maynard Keynes described its ideas about currency as “more truly philosophical than those of any other country” .
It’s difficult to say how much invisible money exists, not just because it changes all the time, but definitions are hard to pin down—just ask an economist. Or an accountant. Or yourself. Would you include cryptocurrencies , long term deposits, short term government bonds? Whatever the definition, banknotes and coins are likely to make up less than 10% of the world’s money supply.
The defining feature of all invisible money is that it exists only as a balance—a record in an accounting system. Whether it’s on a screen or on paper is not what matters—money is, in essence, no more than a mark of a promise.
An example will make this clearer.
Yana wants to buy a car but doesn’t have enough cash. She thinks that a bank might have some, so she asks Big Bank for £1,000.
The bank agrees and Yana signs a loan agreement after which £1,000 magically appears in her current account. She now has £1,000 more cash, and an obligation of £1,000 to the bank. In her accounting records, assets and liabilities both increase by the same amount.
The bank’s accounting records are even more interesting, because this is where the magic happens—well, the conjuring trick— because the bank doesn’t go to its cash cupboard in order to stuff Yana’s pockets with money. It makes an accounting entry. And that’s it—the money appears from nowhere.
Here’s the loan to Yana from the bank’s point of view. Yana’s obligation—the loan—is recoverable by the bank, so it’s valuable. It’s an asset. Big Bank’s asset is Yana’s liability.
The increase of £1,000 in Yana’s current account is in liabilities—it’s the £1,000 that Big Bank has agreed to make available to Yana. Yana’s asset is Big Bank’s liability.
The bank has created cash (and the loan) using double-entry bookkeeping. It really is that simple: Yana owes us, so we owe Yana—boom!—£1,000 is now in the economy that wasn’t there before.
Don’t be fooled into thinking that anybody can do this . It only works because we all believe that the balance on Yana’s current account is cash. Because we believe, Yana can easily transfer that balance to someone else, or go to an ATM to withdraw the balance as physical money.
Being able, at will, to convert invisible money into physical money maintains our belief in the magic, but this, to some extent, is also illusory. The banking system will collapse if everybody simultaneously goes to the banks to convert their current account balances into cash — there’s not enough physical cash in the world for that.
Governments understand that our trust in money and the banking system are important threads that hold the fabric of society together, which is why they do almost anything — as they did in 2007/08 — to keep the banking system functioning.
The Bank of England has published a series of articles and videos that deal with this topic in a broader context:
Notes and further reading
 I recommend Felix Martin’s Money: the unauthorised biography (Bodley Head, London 2013). In fact, Martin’s book is a wonderfully readable treatise on money as an accounting mechanism.
 In the absence of an accounting standard for cryptocurrencies, the existing standards are applied. Cryptocurrencies fail the definiton of cash equivalents under IAS 7 Statement of Cash Flows. Neither are they financial instruments under IFRS 9 Financial Instruments. This leaves them, for the time being, under IAS 38 Intangible Assets. [For a more detailed explanation, see this ACCA Technical Article: Accounting for cryptocurrencies.
 Although lots of people did exactly this during the Irish banking crisis of 1970 when the banks closed and people were forced to exchange personal IOUs in the absence of the cash and bank clearing. Again, see Money: the unauthorised biography by Felix Martin for the full story.
 This isn’t any more real than a bank balance. In the UK, all banknotes issued by the Bank of England make this declaration “I promise to pay the bearer on demand the sum of £X”. This dates from a time when the person holding the note could exchange it for gold of the same value. Sadly, you can no longer do this. You can only exchange your banknote for other banknotes of the same face value. That is, you can swap one paper promise for another paper promise.