Sharpening
Until now, Ludwig had gotten his hands on a bunch of things that he couldn't really use. However, he had refrained from selling them until now.
He knew that Liam would only give him 30% of the profits. That was simply too less for him because he was the one who found the treasures and he wanted to maximize the profit he could earn from selling them.
Liam didn't mind that kind of attitude. He wouldn't give up on 70% of profits just because the other party was in possession of a shop as well.
However, now that Ludwig had not sold any of the treasures he had collected, Liam had a big variety to choose from.
He didn't really like teaching, but he could demonstrate a bunch of things in exchange for the right type of payment. Of course, it had to be of use to him, otherwise, the deal would be pointless for him.