Mainstream economics would have us believe that interest rates are determined by the “invisible hand” of the market, except on those occasions when the Federal Reserve or other central banks intervene to modulate borrowing costs. One of the benefits of the current scandal embroiling the British bank Barclays is that it reveals the flimsy and fishy nature of one of the key rate-setting mechanisms of the global financial system.
That mechanism is the British Bankers’ Association’s London Interbank Offered Rate, an interest rate index that has been around since the 1980s. While LIBOR’s primary function is to represent what it costs big banks to borrow from one another over the short term, it has become the linchpin of hundreds of trillions of dollars of financial transactions ranging from complex interest-rate swaps to adjustable-rate home mortgages.