"Reverse" Market Postings

As of current people selling can post on the market whatever they have with bids/buyout. "1000 wood for 400g" etc etc

What about a 'reverse' posting. This would allow someone to post "400g for 1000 wood"


This could be something that gets unlocked with higher level markets.

(I really support higher level markets unlocking more capabilities, to give a better reason for it to get leveled up)