What we are basically going to do is this:
a) Shop A likes an item from Shop B
b) Shop A approached shop B for a trade request
c) If Shop B also likes an item from shop A or any item that shop A has to offer then both of them are ideal contenders for a trade.
d) Both shops check the price of the items in question as well as the shipping cost. The total price must match - for instance both should be $30 or $20 or whatever it comes up to. Slight difference can be OK if the shops are OK with it
e) The shops buy each others items from the others shop using the "other" payment option.
f) The seller then has to send the item to the address of the buyer whom they traded with.
What you gain : - You get an item without actually paying for it. All you spent was the shipping amount.
What you also gain:- A sale from your shop -and a prospective review - which lets more people know that you have made a sale
What Etsy gains :- the transaction and listing fee