Hi everyone, For a while I had this idea in my mind and i want to write about this idea after i saw 
source: https://www.bamf.media/growth-hacks-online-marketplace/
It is about a marketplace like a ebay or other e commerce websites.
As you know that we are living with steemit platform and we are using our steem. But we have to use our steem in daily life. If we want to buy anything, we use fiat currency and buy. But we can do this with steem. But for this that we need a marketplace platform.
I think if we create marketplace platform on steem blockchain then we can shopping together. For example when i want to sell anything, i can use this platform.
Ok How to get trust? Probably this is the most important question. I think we use a escrow system and when i put my stuff on sale, the person who wants to buy will be able to see my stuff on the platform. Later the person who confirms the price. But steems will not be credited to the seller's account immediately. Steems is kept in the escrow account until the transaction is fully realized as in the same delegation system. when the seller delivers the stuff to the buyer, steems on escrow account is released.
If a seller is a reliable person, then vote for him/her. So a voting system is added to check reliability.
This is a complex system and something may be missing.