That's a good thought!
I guess that the only thing that is needed to create such "simple trade" is a big network and a reliable delivery service.
Most of us in the developed world, have very easy access to shops, tools and money to purchase needed items.
But if you are in a country where you are missing a few spark plugs to get electricity, i guess that its an enourmous task to get online and order it, or contact someone that has easy access to spare parts to donate.
(Sometimes the hugest charity organisations are distributing things that the people in need doesn't need or doesn't have any use for. And can sometimes forget the simplest things that people in fact depend upon.)
If someone are willing to start a network for "demand and supply" I would gladly join and try to fill some of the requests, for items that are easily deliverable via mail, or so that i can help to organize from a factory or supplier closer to the person in need.
Perhaps a spin-off of Kiva? with an online catalogue for offered and requested items?
