I didn't set a commission for my algorithm thinking that the default commission of 0.03 would be used for the backtest and live contest results. Am I wrong here? If not then what stops me from setting a commission of 0.0000001?
By the way, I also trade on IB are at the fixed rate, so 0.005 per share buys, 0.0074 per share sells (total after all fees). Wondering why here the commissions are so much larger here.