Well, the RoI has a very different duty regime... You'll notice I was refering to changes in the level of duty, not the absoulte level. That, obviously, is down to the govt.
As for rapid price fluctuations, that's exactly what you'd expect when supply and demand are very finely balanced for a commodity with low demand elasticity.
As for rapid price fluctuations, that's exactly what you'd expect when supply and demand are very finely balanced for a commodity with low demand elasticity.