In thinking about the App EconomyI thought about Webvan, the first "deliver everything cheap" digital concept & realized that, at least by the WP article, people still completely fail to understand why it failed - which explains why we keep falling for these untenable businesses.
The cost-setting factors in shopping & delivery have nothing to do with anything a digital intermediary can fix. The only way is to exploit and/or cheat somebody in the value chain.