No general consensus, only the two parties in the last trade did consent. Edit: Actually, the buyer valued the bitcoins higher than the last price, and the seller valued it lower.
Some of the supply and demand curves you can see in the order books on the bourses. The rest of the aggregated demand and supply is in the heads of the market actors, which are all of humanity.
This is general market dynamics, everybody should learn to understand the market.
Currently, people discovering bitcoin and valuate it at a higher price than the last trade, are important for us.
You're the 3rd person to post a generic statement about how the market price is already a consensus, without actually reading the thread or looking at the link. This is about predicting the future price, that's what the link in the OP is for. I just changed the thread title to make it more clear, my mistake if it was confusing.