From June 8th to June 16th, the S&P 500, the index of the most valuable traded companies in the United States, dropped 520 points, or 12.5%. About $4 trillion of market capitalization was vapourized in just over a week. That is, by any measure, a staggering amount of money. It is equal to about $12,000 for every person in the United States, or about $560 for every human on earth. The proximate cause was the increase in interest rates in all the developed countries. Central bankers around the world acted in concert to combat inflation by quickly raising rates. In the last six months, the yield on 2 year US government bonds has risen almost exactly 2.5%, from 0.65% to 3.13%. Rates to borrow money have risen equally quickly. The interest rate for a standard mortgage in the US has risen from 3.1% to 5.3% in the same period.