answer:The economic foundation circa 1970 was pretty shaky. In 1971, Nixon severed the relationship between the dollar and gold, which had severely restricted the ability of the economy to grow. But at the time, the financial markets did not have a very effective way to combat inflation.1971 in particular was awful, with Nixon imposing wage and price controls in order to “stabilize” the economy. And other disruptions were caused because foreign exchange was restricted. Since then there are futures markets for a variety of financial instruments which reduce risk and make economists better able to anticipate disruptions.