How do you calculate when to stop stocking and start buying out your market? Is there a formula for this? In the past I've just gone by "feel", would like something more concrete to go by. Any help would be much appreciated. This particular question refers to the primary server.

It's not really a formula, more so than a spreadsheet.

If there is X turns left in the reset, then you want A = B to match

A = (Stock + future stock gained over M turns)
B = (Amount of money it takes to buy out your PM over N turns of regen)

where M+N = X.

awesome, thanks, how do you calculate the regen of your pm?

Every turn, your PM regens

Troops: 3 x acres
Jets: 2.5 x acres
Turrets: 2.5 x acres
Tanks: 1 x acre

apreesh.