It started with a breast pump and a handbag. Sarah Ouellette had one and wanted the other. At €450, the breast pump which she had used just twice after her daughter was born, had been abandoned to the back of a cupboard.  It was an asset, but a useless one to her, and it was coincidentally worth the same amount as a designer bag she was eyeing.  Familiar with the circular economy for buying luxury goods like clothes and shoes, Ouellette looked to sell the pump online.  It didn’t go well.  The only avenue she could find to sell the pump…