What do world's richest people buy? Find out...

When it comes to shopping, billionaires are different. They prefer to buy the most expensive, biggest and fastest products.

Here, we take a look at some million-dollar billionaire 'buys', according to CNBC.

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Paul Allen

History: Co-founder of Microsoft

Item: Yacht

Price: $200 million

The yacht is more than 400-feet long and is outfitted with a basketball court, a hot tub, and, of course, landing pads for two helicopters.

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Phil Ruffin

History: Gambling, real estate and oil production

Item: Boeing 737 jumbo jet

Price: $70 million

He spent $70 million on a Boeing 737 jumbo jet , then put an additional $15 million into renovating the interior, which he outfitted with leather seats, two full bedrooms, and a $1 million entertainment system.

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Truett Cathy

History: Founder of Chick-fil-A

Item: Batmobile

Price: $250,000

While 1992's Batman Returns film may not be the most memorable installment in the Batman movie franchise, it made such an impression on Cathy that he spent $250,000 to buy himself the Batmobile used in its filming.

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Hassanal Bolkiah

History: Sultan of Brunei

Item: Rolls Royce convertible

Price: $14 million

The prize of his fleet is the Star of India, a Rolls Royce convertible that he bought for $14 million, making it the most expensive car in the world by far.

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Roman Abramovich

History: Owner of Millhouse

Item: Yacht

Price: $450 million

It's the largest yacht in the world and it has amenities that can be hard to find on most luxury yachts, such as a missile-detection system and a submarine.

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Bill Gates

History: Chairman, Microsoft

Item: Scientific journals

Price: $31 million

Gates has bought one of Leonardo Da Vinci's few surviving scientific journals, which he purchased at a 1994 auction for almost $31 million.

Rather than keep it to himself, Gates had it scanned and made its contents available to the general public, who can buy it on CD for $30, or less than 0.0001 per cent of his original purchase price.

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Richard Branson

History: Chairman, Virgin Group

Item: SpaceShipTwo

Price: N/A

Branson unveiled his galactic vessel, SpaceShipTwo, at the NextFest technology exhibition in New York City. It seats eight, including two crew members.

Once in sub-orbital space, passengers are encouraged to unbuckle themselves and enjoy the experience of weightlessness inside the fuselage.

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Steven Spielberg

History: Film director

Item: Rosebud

Price: $60,500

In 1982, he purchased a piece of movie memorabilia at a Sotheby's auction for $60,500. The item was "Rosebud", the sled from the 1941 Orson Welles classic film Citizen Kane.

At the time of its purchase, it was the most expensive movie prop ever sold.

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Mark Cuban

History: Owner, Dallas Mavericks

Item: Private plane

Price: $40 million

In 1999, Cuban bought a Gulfstream V, a private plane normally used for business travel that's sometimes used as a military vehicle.

It set him back $40 million, and it also earned him a spot in the Guinness Book of Records, as it constituted the single most expensive e-commerce transaction in history.

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Victoria Beckham

History: Singer

Item: iPhone

Price: $36,000

She was seen at New York City's John F Kennedy International Airport carrying a custom-made gold iPhone. The device cost just under $36,000, and featured a photo of her dreamy athlete husband, David Beckham, in all his shirtless glory as its wallpaper.

Although she is not a billionaire, she has made it to the list because she engages in displays of conspicuous consumption that rank right up there with those of billionaires.