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The Proverbial Wallet: Gets Harder to Open the More You Spend

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The brainiacs up at MIT have created prototypes for something they're calling "The Proverbial Wallet"—a wallet that's in sync with your bank data and that signals you've spent too much by buzzing and becoming more and more difficult to open as you reach your monthly budgetary limits.

(Um, this is a great idea. But we don't know about you—if we had one of these, we'd just start carrying our credit cards around loose, in our pockets.)
· Smart wallets react to electronic spending my refusing to open [Consumerist]