Roy Oldham Posted almost 2 years ago Tali Sharot: The optimism bias Advertisers and governments use this bias a lot and I suspect that they use deliberate tactics to encourage and reinforce it. "Of course artificial sweetener is safe, look at these happy people dancing." "This war won't take long, we will get the bad guy and be home for summer." Perhaps this bias leads us to not be critical enough of the information we get. It's quite possible that this bias leads us to give greater weight to information telling us that something will have a positive outcome than information telling us that the same thing will have a negative outcome. My question now is; Just how much does negative information need to outweigh positive information before we will consider it with equal merit?