Basic Economics

[Jinko]

1- If an auction house is implemented, it should be nation specific (not an instant global store).

I couldn't disagree more, unless they make traveling between cities a whole lot easier, otherwise doing this would cause huge problems in availability.

For example almost nobody visits Limsa anymore and even less visit Gridania.

Even then I still think Global linkage would be the most efficient and easiest method.

2- Nation specialization. For example, one nation has better resources for armor, another has tanning, a third has culinary. obviously not those exact examples, but you get the idea. I know FFXIV already has this to an extent, and I like it.

See above.

3- Trade boundaries. For example tariffs, quotas, price ceilings/floors. This will add a level to the market complexity, and make trade more fun. Plus SE can use these measures to fight inflation/deflation later in the game life.

I think this is something that should be used later in the game life (once there is a thriving market).

This I agree with, having say a button which would input the current average price for an item would help stabilise the economy, as would having a ceiling/floor on items.

With something like an average button players could get an estimate of what an item is worth and then decide whether to alter the price as they see fit.

Of course before any of this SE needs to find a way to remove items (mainly armour and weapons) from the world otherwise there will be a surplus and the market will crash, which has already occurred on some stuff.