Nails and Multipliers

This is not a complaint, just an honest question:

Why have the nails gone up?

I know that we used to buy at 20 and sell at 20 and now it is buy at 40 and sell at 20. I could see that this might be due to that fact that no profit is made using the old system but how does the change benefit the city?

I have no problem at all with helping the city of my birth but I am afraid that matters of finance are simply way above my head and I could do with a sort of simple guide to all of this.

Please don't think that I am accusing anyone of ripping us off. I would never dare do that; but I do have an insatiable desire to understand why we pay more and what was wrong with the old system.

Olivia, the Fair and Gentle