Modifiers of the idea, system advisors, stability.Half of the Trade Efficiency is an additional percentage of the Trade Power.Mercantilism can be modified by means of events. The current percentage multiplied by two is an additional TP generated by each province. Erecting new buildings also increases TP. Additionally, coastal provinces in the middle of the trade are going to generate higher TP than the remaining ones. That is why it is immensely important to hold a stronghold in the distant regions e.g. Provinces, the more provinces you have in a given region, the higher the trade power, for the local node, you are going to generate.Trade power depends on the following factors:

for high stability, are global for all nodes). This value varies for each trade center (although some modifiers, e.g. Trade power determines how much of the entire pie you are going to get. Note that it is not a value that has bearing on the amount of money in a node (that is what trade value is for).

Trade Power is a key factor of how much you actually are going to get. How much money you are going to collect for yourself, depends on the current trade power. What you want to do, then, is establish a transfer route from the starting point A, through B, to C, where you have great control and where you are going to collect the money (much more than if you collected it in points A and B, where your share in the market is low). The larger your control over a given trade node, the larger percentage of the money, coming from the total, you receive. Steer the trade, conforming with the route, over to the next center.You can order a merchant to do either of two things: You dispatch merchants to trade nodes (only within your trade range modified by diplomatic technology and ideas), where they attempt to seize as much control over the local trade route as possible. Furthermore, merchant republics have one more base merchant. This number can be increased through ideas (especially Trade that provides three extra merchants) and decisions. There is a base number of two per each country. A trader can amass money or send it further, in hope of making a larger profit

Europa universalis 4 mercantilism