It took Wal-Mart a long time to wake up and realize they have one of the largest captive workforces in the world (and that there's a lot of untapped on-demand v

It took Wal-Mart a long time to wake up and realize they have one of the largest captive workforces in the world (and that there's a lot of untapped on-demand value therein). Great move on their part to start experimenting with this.