Bill sits down in November with nineteen months of data. He has never looked at it this way before: not as individual months but as a line. From 1,000 euro in April 2024 to a net worth of 6,268 euro at the end of November 2025.
The line goes up. But the slope has changed.
From June 2024 to August 2025, the surplus averaged 480 euro per month. From September 2025 onward, after the move, the revised surplus went negative. The line that was climbing steeply has flattened and is now tilting slightly downward.
Multi-year equity evolution is the analysis of how net worth changes across multiple reporting periods. The question it answers is not just what the current number is, but whether the trajectory is sustainable and whether recent decisions have changed its direction.
Bill's net worth at the end of November 2025 is approximately 6,268 euro. At the 185 euro surplus he had planned for the new structure, he would have reached approximately 7,019 euro by now. The difference is the compound effect of the September friction and the lifestyle inflation recorded in EP.19.
He makes three decisions. He cancels the gym, again. He makes coffee at home on four days out of five. He keeps the train home because it is the one expense he does not want to question. He also returns the food and miscellaneous budgets to their May levels, now that the friction of the new city has faded.
The adjusted monthly surplus from December is 100 euro. It is less than before the move. It is better than negative.
The tip
Plot your net worth as a line at least once a year. The number on any given day is a point. The direction of the line is the information that matters.
Multi-year equity evolution, November 2025: net worth 6,268. Projected at the planned surplus: 7,019. Gap: 751. Adjusted monthly surplus from December: 100. Trajectory corrected but not restored.
Bill is 25. Every episode, we read his personal ledger through accounting eyes. / FY 2025 ledger