If you mean something as gigantic as Amazon, probably not.

If you mean an eCommerce site that allows you to sell products than yes you can but you'll probably need to hire a developer to build some of the functionalities you'll need.

Thank you very much for your reply!!

It sounds like you're trying to build a multi-vendor ecommerce marketplace.

If that's the case, Concrete5 (unfortunately) isn't for you. I would suggest Magento or CS-Cart Multi-Vendor Edition.

Also, Sellacious looks promising:http://sellacious.com/

However, if you're just looking for a standard ecommerce solution, there is a free open source ecommerce plugin available on Github called Community Store.

Hope that helps.

Thank you very much for your reply! Yes, I meant Multi vendor marketplace. I'll try your suggestion. Thank you again!!

if you only need a "small shop" and don't want to replace amazon, concrete5.8 with free package community_store (https://github.com/concrete5-community-store/community_store) works well, we use it since the beginning of this year with great satisfaction