Aid

Provinces can send some types of resources to others in their Kingdom as aid. This can be used to send gifts or to trade resources - e.g. runes for gc.
Since Age 68, sending aid counts as an aggressive action and so prevents some actions (e.g. accepting invitations to other KDs) for 24 hours
== Types of Aid ==
The following resources can be sent between provinces in a kingdom:
Resource Type	Trade value
GC 	1gc
Food 	0.05gc
Runes 	3gc
Soldiers 	100gc
Land 	1500gc
 
Land that is sent as aid is taken from and received in each province's explore pool and 33% of the acres sent are destroyed when sent. A provinces current acres cannot be sent as aid. 
The maximum size of any aid shipment is four times the receiving province's networth. 
== Trade Balance ==
To prevent abuse each province has a trade balance of how much net aid they have received. Each provinces trade balance and current tax rate is shown on the Aid Page. 
Every aid shipment sent from a province generates a positive value on their trade balance, and the recipient province receives a subtracts from their trade balance. 
Each Utopian day, trade balances decay by 10% per Utopian Month.
== Aid Tax ==
If a trade balance drops low enough then the aid a province receives starts to be taxed. The Tax Rate is based on the province's networth and their Kingdom's median province networth and their trade balance. Taxes effectively destroy a portion of each aid shipment.
Provinces with positive trade balances are not taxed. 
Taxes on aid start to apply once a negative Trade Balance reaches 400% of either the province's networth or their Kingdom's median province networth, whichever is greater.
Base Tax Rate = -4 * (Trade Balance / MAX (Net Worth, KD Average Net Worth) + 4)
Tax rates are never negative and the maximum tax rate applied is:
* 15% for provinces below 25% of their Kingdom's median acres
* 80% for provinces larger than or equal to 25% of their Kingdom's median acres.