what the expensive car in the word

As of my knowledge cutoff date of 2021, the most expensive car in the world was the Bugatti La Voiture Noire, which reportedly sold for a price of €16.7 million (approximately $19 million USD) in 2019. Only one of this model was produced, and it is a hand-built, bespoke supercar with a 1,500 horsepower engine and a sleek, aerodynamic design inspired by classic Bugatti cars from the 1930s.

However, it's worth noting that there are constantly new and expensive cars being developed and released, so the title of "most expensive car in the world" may change over time.