What does "unjust enrichment" mean in terms of shipping costs, and does a seller have to prove the actual costs, or can they set their own shipping conditions?

ByForresterNico

Hello, I'm interested to know if it's legal to charge more for shipping than is actually incurred, i.e. to enrich yourself through shipping, and whether the seller is obligated to provide information, to "unravel" the shipping costs and to provide evidence of this. I once heard of a buyer on eBay who wanted the shipping…