governors. she could have stayed on as governor until 2024. instead, she will leave next year after her successor, jerome powell, is sworn in. yellen is the first fed chair in three decades not to receive a second term. all right, forget venmo, cash is still king! it's true, digital payments have multiplied in recent years, but u.s. cash in circulation has risen nearly 90% over the last decade, according to a federal reserve study. in total, $1.46 trillion in physical u.s. dollars exist. the majority is actually held outside the country. uber plans to buy up to 2,000 self-driving cars from volvo beginning in 2019. the autonomous revolution. if the nonbinding deal goes through, it will be volvo's biggest sale of autonomous cars yet. uber's self-driving system is still being developed, but in the future, uber could make driverless cars available to passengers. that deal comes as the company struggles with its human drivers. uber was fined $8.9 million monday for improperly conducting background checks in colorado.