Vincent,

Thanks for your message. You are right on track with what I am thinking. If you could fold/ collapse the trays, it would help and also reduced the use of plastics.

I think the idea can certainly carry traction once RFIDs become more commonplace. No need to scan item by item, less of a factory feel and more of a community experience.

RFIDs will automatically get scanned and a contact-less payment could be used. Effectively, zipping in-and-out of the process of check-out.

Maybe "check-out" can transition into better terms.

How can this be implemented in places where it snows or where water is scarce?

It would be interesting to build on your idea of a calendar of what produce is in season with the mobile app and use your location to determine what is local where you happen to be.