What the letters mean
S means buy it before you leave the plot. A means it feeds a line that already sells. B means a side area after the starter sale is stable. D means it does not fix a stopped line.
S tier
Player decision Buy this before side areas. Editorial priority for a new plot, not an official rank.
Player decision Hire the worker after you have carried one item yourself and confirmed which drill it staffs.
A tier
Player decision Add supply after the starter sale works, and again when a new factory drains the tank.
Player decision Open them after the refinery handoff is staffed, not instead of it.
B tier
Player decision Visit the farm first among these three, because the beanstalk chain is also the dynamite route.
D tier
Player decision Skip them while a tank is empty or a carry is still manual.