1/3 tax rate... It's so real that it's sad.
They trade in goods and not currency so they don't have to worry about their government printing money and making their valuables worthless, so maybe 1/3 tax rate is actually better than real.
In my country the value of money has gone down by 33% in just a few years, add to that the taxes that are at minimum 25% across everything MINIMUM. Well it's bad.
Anyway, dragon saves the day. Normally in manga nobles are evil (other than MC that is also often a noble), but this guy you can trust because hes some half blood disliked noble, the more you are hated the kinder you are right? Do not apply manga logic to real life.