Ok, here is a real world example of how rich people can dump the economy... The emperor of Mali, the richest man ever, decided to take a pilgrimage to Mecca. Being a muslim, he believed in charity so along the way he brang wagons of gold. In Egypt, he gave a lot of gold to the poor citizens there. In a few days Egypts economy was destroyed due to inflation. Mansa Musa, the emperor actually had to take a lot of that gold back to stabalize the economy. See kids. If you don't learn from history you are destined to repeat it ...
Damn son, this sounds familiar. Oh yeah just learned about this last week xD. The same thing happened in the western usa, remember that time called the gold rush, money became so abundant that it was actually worth less this is why my house in north carolina would we worth 4x as much if we lived in california. This is called inflation as sky already mentioned.
Why did you guys add the blackmarket feature then... You are right tho, I Would also leave it like this if I was in your position.