Text ３ 　　No longer do you need a net worth in the hundreds of millions of dollars to have one private jet. With 700 jets, Net Jets, the fifth-largest airline by number of planes, has access to thousands of private airports. Its main innovation was to apply the principle of fractional ownership, or time-sharing, to the ultimate executive tool. Customers buy a share in a jet which entitles them to, say, 200 hours of travel a year. 　　As a result of a combination of new technologies and businesses, a small trend is observable. Never before have so many people been able to get access to the accoutrements of tycoonery — private planes, luxury yachts, fancy cars and interior-designed, exclusive homes. Of course, the sharing economy was hardly inspired by the needs of the rich. But in some ways it suits them perfectly. The whole idea depends on people having spare assets that they are willing to rent out to total strangers. Who has more spare assets than the super-rich? And who loves extra income more than people who have spent their lives accumulating money? 　　On the other side of the market, bustling plutocrats are an ever-present source of demand for temporary accommodation and bursts of luxury. The system can even have a strange public-relations benefit. A wealthy boss who makes use of Net Jets won't need to explain to his shareholders why he bought a jet, even as he treats the one he flies on as though it were his own. GetMyBoat, a San Francisco-based company, gives customers access to motorboats, luxury houseboats, yachts and jet skis in 7,100 places around the world. A home-sharing club called ThirdHome.com allows people with just a couple of homes to live as if they have a dozen. 　　One authority on the American wealthy, Robert Frank of CNBC, believes that the rich are “floating off” into their own country, while that things are getting better for more rich people does not contradict Mr. Frank's broader understanding. Once upon a time you had to be born rich to join the global elite. Then you had to make a hundred million dollars, and then the threshold rose to a billion. Now goods and services that used to be confined to a handful of tycoons are available to the millionaire or pretend-millionaire next door, thanks to the magic of the sharing economy. 　　The super-rich may be floating off into their own country. But more people can join them, even if temporarily, than ever before.