INFPRMATION ON SHOP WORKING

I'm not sure I understand your question. I'll answer a couple of related questions.

1. You can have an constant supply of goods to your shops if you set the output of your factories to go to the product warehouse.
2. You can increase the amount of stuff your stores sell by having a high "shop value" for each store. If your SV is too low, sell more different kinds of products in your store.
3. You can upgrade your store to be able to sell more stuff in your store.
4. You can build more stores to sell even more.

There's a really good manual that will tell you all the ins and out of IT
http://en.industrie-tycoon.de/downloads.html

There's also a Wiki
http://en.wiki.industrie-tycoon.de/index.php?title=Main_Page

-Dave
One-Stroke (slow)
No-Knots (speed)