psychology and emotions contributes mostly to trading success or failure, I think they both have equal weights in effect on an individual in the trading industry
For example indiscipline may most likely have the same effect as fear or greed on a trader per time....what you think, does one have influence more than the other and how?
Both have almost equal effect because literally one breeds the other so well, an emotional person wouldn't have a good psychology and someone who isn't okay psychological cannot have the best emotions to trade, so both needs to be in place properly for one to eb able to trade well, a good and stable psychology has got its own role it plays to keep someone emotionally stable enough to trade so for me I don't see any about the other but the two working together for a complete and healthy gambling environment to promote successful and profitable trading.