When elderly care (service housing, home care) is cut, some older people have to wait in hospital for a care place. A hospital day costs about twice a day in service housing, so part of the saving comes back as health spending within the same year.
Of every 100 euros that a change to “Old age (elderly care services)” saves or brings in, 30 € comes back as extra spending on the line “Health: hospital services”, starting after 0 yrs and building up to its full size over 1 yr. (The other way round if the change adds spending or cuts taxes.)
Rough derivation: if about 15% of the care that is cut is replaced by waiting in hospital (the share is an estimate) and a hospital day (€308–359) costs about 2.1 times a day in service housing (€124–174), about 30% of the saving returns. The effect also works the other way: more care places free hospital beds.
Share of the change's own effect on the balance, year by year while the change continues: −15% means 15% of a saving comes back as cost (or 15% of extra revenue is lost). With the default values.
You can switch the effect on or off and adjust its assumptions in the simulator under Cause-and-effect chains.