HydroWorld: Nolan's World - Season 1, Episode 36: "Tricks of the Trade"

All of the fifth-grade students from Rippon University School head north on a Field Trip to the HydroWorld Space Trade Center for a detailed, hands-on experience with trading and bartering. They learn that whatever they receive in return should be equal in value to what they exchanged, and that it should always make both sides happy no matter what.

In the trading shop, Nolan and his friends search for things they would want in exchange for other things, such as clothes, toys, and books. Nolan refuses to exchange anything, that is until he finds a gigantic hovercraft ship that he wants. After observing how fascinated he is with the vessel, his friends encourage him to trade something in so he can keep it. Nolan immediately refuses and vows never to trade in any of his high-tech Hydro-Gadgets under any circumstances. He will just purchase the vehicle with money on his own time.

Then his friends show him that this particular type of craft is exclusive to the trading shop, and that the only way he would be able to get it is by trading in something of his own. Nolan is still discouraged, but he can't just abandon his dreams of having one.

Since he happens to have one of his smaller, collapsible hoverbikes folded up in his pocket, and he has several of them in his Hydrocave anyway, Nolan sacrifices it for the larger vehicle. The shop manager accepts the craft and gives Nolan the vehicle. As Nolan takes his new vessel home that afternoon, he learns that trading things can have big rewards.