Elon Musk is already the world's richest man, but today he could take a giant step towards becoming the world's first trillionaire. Shareholders at Tesla are voting on a pay deal for their chief executive that is unlike anything corporate America has ever seen. The package would grant Musk , who already has a net worth of more than $400bn, around 425 million shares in the company. That would net him about $1trn (£760bn) and, perhaps more importantly to Musk, it would tighten his grip on the