Beware the 'black swans' in your supply chain

Enterprises know that merely having a supply chain involves a certain amount of risk, but few do enough to protect against the one-off, extreme incidents that can disrupt them.That's according to Yossi Sheffi, an MIT professor who is director of its Center for Transportation & Logistics."Events that rarely happen but wreak havoc pose the most dangerous threat to corporate health," Sheffi wrote in an article this week in The Wall Street Journal.Such events -- sometimes referred to as "black s