Voters go to the polls this Sunday to decide whether to cap the country's population below ten million people until 2050.
The proposal, backed by the Swiss People's Party, could force Switzerland to renegotiate key agreements with the European Union if the limit is exceeded.
Opponents warn the measure would hit essential services, especially healthcare.
Hospitals and care homes say they rely heavily on foreign workers, with nearly half of staff at Geneva University Hospital coming from abroad.
Recent polls suggest voters are leaning towards rejecting the initiative.
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