How to lose $2.1 trillion in a year: 12 bad months for billionaires

January: warning shots Musk, the world's richest person at the time, loses $US25.8 billion on Jan. 27 after Tesla Inc. warns about supply challenges. It's the fourth-steepest one-day fall in the history of the Bloomberg wealth index and foreshadows a rocky year ahead for Musk, both personally and financially. February: oligarch wealth obliterated Russia's richest people collectively lose $US46.6 billion on February 24, the day Vladimir Putin orders his army to invade Ukraine. In short order, authorities in the European Union, UK and US target Russia's "oligarchs" and their companies with sanctions that make it next-to-impossible for the business tycoons…