Measure the income increase, then divide upgrade cost by that increase to estimate payback time.
This Don’t Steal the Dumpling Squishy cash guide starts with values shown in your save. Record cash rates and costs, calculate goal time and payback, compare plot slots, and estimate offline cash without claiming hidden formulas. Observe rate and cost changes, compare payback, plan targets, and evaluate plot slots. Compare each slot cost with player-observed added earnings and Index goals; expansion unlocks slots, while exact costs and tiers remain unknown.