Every generation of children discovers anew the intoxicating pull of the rare and collectible, and every generation of teachers must reckon with what that pull does to a classroom. Woolworths' Disney Ooshies — small figurines earned through supermarket spending — have swept through New Zealand schools with enough force that principals from Waikato to Auckland have asked families to leave them at home. The items themselves are innocent enough; it is the economy of desire they create among children — the trading, the losing, the grieving over missing pieces — that quietly erodes the conditions n