Budget Balancing Game Rules: How the Numbers Work

The one rule behind all the others

Every budget balancing game, from a classroom worksheet to a browser simulation, runs on the same tension. The money you need does not exist yet, and the people who will pay it are the same people whose approval you need to stay in office. Everything else is bookkeeping.

The rules exist to stop you escaping that tension through cleverness. You cannot simply print money, or default, or discover an unclaimed €54bn. What you can do is choose who pays, when, and how visibly — and then live with the answer.

It is worth saying what the rules are not. They are not a moral system: the game does not grade whether a tax is fair or a cut is wise, only whether the package holds together politically and arithmetically. They are not a forecast either. They are constraints, and constraints are what turn a preference into a decision.

Rule one: the deficit is a flow

The deficit is measured over a period, normally a year, and expressed as a percentage of GDP so that it can be compared across countries and across decades. In the game you start with a drift scenario in which the deficit runs to 5.9% of GDP, and a target that is simple to say and hard to reach: below 3%.

Because it is a flow, the deficit reacts quickly to what you do. Cut spending in February and the annual figure moves. Raise a levy in June and the revenue arrives late but it arrives. This is the part of the game where effort converts into results almost immediately, which makes it the comfortable part.

Rule two: the debt is a stock

The debt is everything still owed, accumulated from every deficit that was never repaid. It is also expressed as a share of GDP, and it moves slowly, which is exactly why it is dangerous. A stock can keep growing even while the flow is shrinking, if the flow is still large enough and the economy is not growing fast enough to shrink the ratio for you.

France’s public debt stood at roughly 113% of GDP at the end of 2024, with a deficit of 5.8%. Those two numbers are the reason the debt ratio, rather than the deficit alone, decides whether a season was actually well played. Getting under 3% is the headline. Getting the debt ratio to fall is the win.

Rule three: political capital is spent, not summoned

Hard measures cost political capital. You spend it when you decide to raise a tax that people notice, freeze a benefit that people rely on or close a programme that people defend. The game does not let you borrow unlimited courage: capital is a finite resource for the year.

It refills partially each January, which creates one of the most interesting decisions in the game. Capital you do not spend is not banked for a crisis in the way you might hope, but spending it badly in February means arriving in November with nothing left for the amendment session, when the package is most fragile.

Rule four: popularity has a floor

Popularity measures how the public is reading your mandate. It falls when the pain is visible and rises when the government looks competent or when a measure is genuinely popular. Below 15%, the prime minister summons you. Three warnings and you are out, regardless of the deficit.

This is the rule that stops the game being an arithmetic puzzle. A minister who ignores popularity can post an excellent deficit number and still lose the season in October, which is roughly what has happened to several real governments.

The floor sits where real governments start to wobble. A government can govern for a while at low popularity, but the margin for error disappears and every further measure meets a louder objection. In practice, low popularity raises the political cost of everything you do next, including things you have already announced.

Rule five: the bond market votes at every auction

The tenth indicator is the 10-year bond yield, the interest rate investors demand to hold French government debt — the OAT. It is not a score you choose; it is a price other people set for your credibility. When the yield rises, every future budget becomes more expensive, because more of each year’s revenue goes to interest rather than services.

Markets are not judges of morality and they are often wrong about the future. But they do not need to be right to hurt you. In the game, a package that convinces nobody can push the yield up and turn a good plan into a bad year, while a credible package can buy you patience you have not yet earned.

Rule six: the calendar only runs forward

The season runs January to December, one episode per month, and there is no undo. Each month resolves, the world reacts, and you continue from the position you have created.

• You cannot replay a month once it is submitted.
• Political capital refills only in January, and only partially.
• The Commission review in May follows the package you built in February.
• The amendment session in November can unpick a package that looked finished.
• The final vote in December is the last decision of the season.

Surviving versus winning

The rules allow two different kinds of success. Surviving means reaching December with a government intact: no censure, no resignation, no forced exit. Winning means something stricter: a deficit below 3%, a debt ratio that is falling, and a popularity number that suggests the country might let you do it again.

The scoring reflects that hierarchy. Finished runs are ranked on deficit, debt, seasons played, survival and popularity, and the top of the leaderboard is usually occupied by players who understood that the order of measures matters more than the size of any single one. The rules are simple to state. The sequence is the game.

If you finish with the government intact and the deficit still above target, the game does not treat it as a total loss. It records the run, scores it and lets you compare it with other people’s failures, which on a public leaderboard is often the most useful comparison available.