Has there been any thoughts given on using varying tariff rates and/or market availability to further express factional flavor?
e.g. In terms of lore, the diktat would demand the highest tariff, because their economy is mismanaged but they get by with the wealth of their natural resources. This drives a bustling blackmarket with lots of items/ships, which the player is incentivized to partake in due to the high taxes. The governing body then try to make up for money lost to corruption by doubling down on bad economic policies and further squeeze the population via taxes.
On the other end of the spectrum, out of the major factions we'd have TT that encourages a relative free market. Due to the sheer volume of legalized trading, they can afford to enforce lower tariffs, and as a result the blackmarket has low availability since things can be legally obtained in open market anyways.
PL and Heg then fall somewhere in between.
And at the very extreme we have Pirates that has almost 0% tariffs. They're a disorganized bunch that care about individuals making money however they can, they don't care about economy, open market and blackmarket are philosophically the same to them anyways.