I have only played Ban twice, once at a negative rate. When I first started out, I went long and ate it twice at a negative rate of 4000U, with a guaranteed price. There will be another time, this time. The rate settlement cycle of Ban has been adjusted to two hours now. If the main force cannot quickly ship empty orders, the cost of holding empty orders for the main force for the next day will be 24% of the principal, with two options.