Successful build - Chance fights ever on the side of the prudent.

Link to build: https://jenkins.wildfiregames.com/job/docker-differential/131/display/redirect

Please have a careful look before changing this.
This aura affects entities with the “Market” class; doing a grep -r Market reveals we should look at the following templates:

campaigns/campaign_city_minor_test.xml
campaigns/campaign_city_test.xml
template_structure_economic_market.xml
template_structure_military_dock.xml
structures/cart_dock.xml
structures/cart_market.xml

The first and second don't actually have a <Market> node, the third and fourth have:

<Market>
  <TradeType>land naval</TradeType>
  <InternationalBonus>0.2</InternationalBonus>
</Market>

to which the fifth and sixth add:

<Market>
  <InternationalBonus op="add">0.1</InternationalBonus>
</Market>

Then we also might want to have a look at simulation/data/technologies/trade_commercial_treaty.json, which has:

	"tooltip": "Market +10% International Bonus.",
	"modifications": [
		{ "value": "Market/InternationalBonus", "add": 0.1 }
	],
	"affects": ["Market"],

As far as I understand it—please correct me if I'm mistaken—the international bonus is a bonus based on what you'd get when trading with your own markets. In other words, 0.1 means 10% more than non-international trade.
What this proposed patch actually does is increase the bonus by 0.02 (= 10% of 0.2), i.e. 2% of normal gain, rather than the 10% it does now.
So if something is to be changed, then probably the tooltips, not the values.

Currently I'm looking at the template_unit_ship_merchant.xml's tooltip. Is the “Garrison a Trader aboard for additional profit (+20% for each garrisoned).” part actually implemented? If so, where? If not, wouldn't it be better to remove that sentence then?

yes it is, see Trader.js calculateGain

Thanks! Found it, simulation/components/Trader.js line 5:

// Additional gain for ships for each garrisoned trader, in percents
const GARRISONED_TRADER_ADDITION = 20;

Wouldn't it be better to define that value inside the trader template, rather than hard-code it in this javascript component?

sure it would :) hardcoded number is bad number :) wanna do patch ?

Yes, I'd like to have one; no idea how to do it myself, though. Perhaps you could help?
[EDIT]: the Persian trader has +25% base gain, so it should presumably add 25% (= 125% of 20%) when garrisoned in a ship, rather than the default 20%.