> > Path-finding algorithms that are currently in use generally don’t support > negative fees. But in this case, the sum of inbound and outbound fees is > still positive and therefore not a problem. If routing nodes set their > policies accidentally or intentionally so that the sum of fees turns out > negative, senders can just round up to zero and find a path as normal. >
Correction to this: The sum of inbound and outbound are not the fees set by one single routing node. When path-finding considers a candidate hop, this adds the outbound fee of the "from" node and the inbound fee of the "to" node. Because those nodes don't necessarily coordinate fees, it may happen more often that the fee goes negative. Rounding up to zero is still a quick fix and better than ignoring inbound fees completely.
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