what is the most expensive car in the world?

I think noone can beat or match the Maybach Exelero *$ 7.8 million (USD)* ..Then again, I could be wrong...

Well it depends on what you mean by most expensive, most expensive sticker price or car that has sold for the most? Sticker I think is the Maybach. Overall there was a '62 Ferrari 330 that won the Le Mans 24-hour race that was sold for $9.25 mil.

there was a ferrari california spyder that sold for 10.1 mil last week

The Koenigsegg Trevita prized around $2,173,950 is the most expensive car.

lamborghini egoista, 100M+ (nobody is gonna buy it for obvious reasons)