Luckily, the number of millionaires; and Ferrari’s potential customer base, is growing. In fact, the number of millionaires in the United States approaches the population of Sweden. To clarify, the Spectrem Group estimates over 10.2 million US households had incomes between $1 million and $5 million in 2018, Bloomberg notes. In contrast Worldometers estimates Sweden had a population of 10.51 million in 2018.