One of the points Sirer brought up was exactly this - without an external feed, the Bancor network will never know if things are working correctly. A malicious

One of the points Sirer brought up was exactly this - without an external feed, the Bancor network will never know if things are working correctly. A malicious party could very use the public nature of the transactions and manipulate prices such that they get cheaper coins or ensure the "asymmetrically price discovery" end up marking coins for hundreds of ETH. OT - Thanks for your illuminating posts. I am a software engineer by profession so most of my learning have been from trying to trade stocks at my country's local exchange so it is interesting to learn things from someone who worked in that field. I was checking your profile and had a question - What is a PE/VC trader? We can talk offline if you want :)