• A wagon will now be called a 'wagon train' - a label change only.
  
• Each wagon train will be limited to 50,000 bags of food, or 1000 tons of stone or lumber.
  
• An advertising fee of 1% of the sale value (subject to a minimum of 0.01GC per resource) will be charged on wagon train arrival, and every 24 hours thereafter, direct from the sellers treasury. If there is insufficient funds in the treasury, the wagon will be sent home.
  
• A sale fee of 5% of the sale value (subject to a minimum of 0.05GC per resource) will be deducted from the sale amount (or taken direct from the sellers treasury if the sale amount does not cover this), when the goods are sold. If there is insufficient amount to in the treasury to cover this, then the goods can not be sold and will remain on the market, giving the seller time to gain some money by other means

For example:

Regularly priced goods
10,000 bags of food are sent for sale at 20,000 GC.
A listing fee of 200 GC is taken every day (1% of 20,000 GC)
A sale fee of 1000 GC is deducted from the sale amount when the goods are sold (5% of 20,000 GC), meaning the wagon train returns with 19,000 GC.

Expensive goods
1 bag of food is sent for sale at 10,000,000 GC.
A listing fee of 100,000 GC is taken every day (1% of 10,000,000 GC).
A sale fee of 500,000 GC is deducted from the sale amount when the goods are sold (5% of 10,000,000 GC), meaning the wagon train returns with 9,500,000 GC.

Cheap goods
50,000 bags of food are sent for sale at 1 GC
A listing fee of 500 GC is taken every day (50,000 bags at 0.01 GC each)
A sale fee of 2500 GC is deducted straight from the treasury when the goods are sold (50,000 bags at 0.05 GC each), meaning the wagon train returns with 1 GC.