[Objects help] sales tax

Every nation with a tribunal can levy a sales tax of up to 10% on all 
sales within the lands. This coin is used to help support the supply 
of guards for law enforcement. The tax is levied on the sale price, 
so while those with negotiation skills to reduce that price will pay 
a lower tax, even though the tax itself cannot be haggled down. 

The leader of the national tribunal decides the tax rate for the nation. 
Uxmal, which has no tribunal, does not have a sales tax.

See also: buy tribunal