There's some great comments here (Machin Shin,btr1701 - legalities et al)which Wal-Mart should take seriously. The model does however pose more questions than answers. Perhaps it would require a 'delivery leader-board' wherein 'deliverers' within specific jurisdictions could be awarded points for successful delivery of goods. Even so, how are deliverers going to be rewarded for their efforts? Product price reductions? There's so many holes in the idea that I think it's actually quite impossible to implement. The legal issues alone could crush it!
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