This approach assumes that you, the consumer, are supposed to take on the price (and problem) of delivering goods from a central "market" to your own home. This is an evolution of the old ox-and-cart system, and it's extremely inefficient.

It's much, much better for you to pick the items you need on the internet, or in a showroom, and have them delivered; the delivery round will be much more energy-efficient, serving multiple customers in one go with one vehicle. We are slowly getting there, one item at a time (first books/cds, then electronics, then nappies, then then then...). The main stumbling block (people who want to check the horse's mouth before buying it) is really not a problem in the age of precise mechanization, food standards and cheap shipping.

I do my grocery shopping online, most of the time.