Key legal question
Whether the cantonal rule limiting employed unsalaried psychotherapists to six persons infringes economic freedom for lack of a sufficient legal basis.
Extracted holding
The headcount cap is a non-severe restriction and the cantonal legal basis suffices; the ordinance interpretation is not arbitrary.
Extracted reasoning
The wording of § 17(3) PsyV/ZH supports a limit by number of persons, not by workload percentages. The rule is a permissible organizational constraint to ensure supervision and does not require an express formal statutory basis beyond the existing cantonal framework.