Through the principle of solidarity, which the Boustany Constitution pairs with subsidiarity at every level (Article 20-bis): municipalities support other municipalities, and Cantons support other Cantons, to narrow wealth gaps and promote shared growth.
In concrete terms, Article 85 provides for financial levelling: the Federation makes grants and soft loans from its own funds to financially weaker Cantons, including those whose municipalities have a particularly low capacity to raise tax revenue.