The youngster, who battled pneumonia when she was two-years-old, now models for children's clothes companies.

BBC: Natalia Goleniowska Pic: www.downssideup.com/

Other groups have created barter economies. thredUP specialises in exchanging children's clothes, but also has exchanges for everything from make-up to video games.

ECONOMIST: Schumpeter

It's a small-scale department store with a variety of clothes for children, women and men.

NPR: Rural Co-Ops: Saving Shopping Options