1
Baseline
What does my farm produce right now?One measured minute of wood and one sell check for cash per wood. Without these two numbers a purchase is a vibe, and after an update they are the only comparison that matters.
Failure mode: Skipping this turns every later step into a guess.
2
Candidate
What exactly changes if I buy this?Name the mechanism: faster chop, more axes on the plot, more plot space, or a boost. Only the mechanism tells you which measurement will move — a new axe changes wood per minute; expansion changes how many axes can work.
Failure mode: 'It's an upgrade' is not a mechanism.
3
Payback
How many minutes of farming repay it?Cost ÷ (rate gain × cash per wood). Under one session: buy. Multi-session: schedule it. Never computed: don't buy yet — the calculator's upgrade section does this part.
Failure mode: Price alone is the trap; expensive upgrades often repay fastest.
4
Confirmation
Did the number actually move?Repeat the identical one-minute test after buying. If the gain isn't there, the candidate was misjudged or an update rebalanced something — either way you just learned it for the cost of one minute.
Failure mode: Assuming the gain is the reason silent nerfs survive for weeks.