You could buy a lawn mower and keep it in your garage. Then you go and knock on the door of ten other houses on your street, and say "I've bought you a lawnmower for Christmas! You just need to keep it in my garage though, rather than your own. Come and use it whenever you like! Please put it back afterwards". And then, hey presto, you have created 10 lawnmowers out of nothing. Unless of course, there's a run on lawnmowers and two of your neighbours need to use it at the same time.