For most teenagers, swapping   an old mobile phone with a friend for the latest album or movie ticket might be considered a good trade.But 17-year-old Steven Ortiz set his sights a little higher, and -- after a series of swaps -- is now driving himself to school in a Porsche.The youngster started exchanging items two years ago after a schoolmate gave him an unwanted phone.Through a series of online swaps, Steven worked his way up through newer phones, laptop computers, and street bikes before landing the prized Porsche.  Steven developed a love for online trading long before taking up the swaps that led to the Porsche.As a young teenager, he would buy his friends' unwanted mobile phones for around PS20, clean them up and sell them over the Internet for three times that amount.  His father, Esteban Ortiz, said Steven was also useful to have around when the family needed something like a new washing machine, as he would use his nose for a bargain to pick up somebody's discarded appliance for next to nothing and fix it up cheaply."I think this is teaching him something.I want him to go to college, and make something of his life.He is learning the value of things, responsibility and negotiation skills."  Steven got his first car at 15, but he was too young to drive, so he traded for a golf cart before moving back into cars when he got his license a year ago.Steven said swapping the Bronco, worth about PS10,000 at the time, for the Porsche was actually a trade down because the car was valued at PS6,000.Another downside is the running costs.He must pay PS100 every time the Porsche needs an oil change, and $1,000 for a routine service.  Steven, however, still has some way to go before matching the achievement of Canadian Kyle MacDonald, who became famous four years ago for turning a single red paperclip   into a two-storey farmhouse through a series of trade. What does Steven's father think of him?   _  .
He took on heavy responsibilities at a young age. He could always get real bargains. He has made some progress and is promising. He has spent too much time bargaining.