I'm never sure the five star metsuke argument is a good one to make for maximizing the market chain. But it's entirely possible I'm missing something. Here's how I look at it:
Assuming you have the tech and provines, to the best of my knowledge the highest you can start a metsuke is with three stars. In my experience I'm usually at mid game when I reach this point and most of my metsukes have spent the first third or half of the game in the 1-3 star range.
Unless you exploit a bit (chain revolutions and bribing the rebels) the leveling time in cities is prohibitive to go from three stars to five. As I recall it's ten game years to go from two to three stars, 15 years to go from three to four stars, and 25 years to go from four to five stars. So assuming you have the tech and provinces to launch a three star metsuke around 1550, you're still looking at 1590 before you hit five stars. In all honesty, I don't think I've ever had a campaign of any length or difficulty go past around 1575.
So yes, by end game your five star metsuke will be churning out tons of cash for you. But at that point (assuming you're still playing) I suspect the game is in sandbox mode and the cash is irrelevant except as a curiosity to demonstrate what can be done.
I think a better evaluation would be of a three star metsuke versus the food loss from building the market chain. I suspect that if you averaged the metsuke level over the course of the game it would come out somewhere in that ballpark. Or better yet, for some enterprising math whiz to show how fast the metsuke would need to reach five stars over the course of a game and how long the game would need to last, to make the market chain worthwhile in those five cities. The whole thing is obviously dependent on empire size, how fast you're expanding, and the value of the top five cities in your empire which further complicates the modeling.
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