Singapore imposes a "minimum qualifying salary' for a foreigner to be eligible to an Employment Pass entitling him to work in a managerial, executive or specialised job in Singapore. The minimum threshold criteria includes earning a salary of at least $5,000, which is benchmarked against the top one-third of the local professional, managers, executives and technicians (PMET) salaries by age. THe threshold is higher for professionals in financial services and is periodically reviewed. While such a measure may not affect foreign investors in a critical manner, it goes in the direction of restraining the possibility of nominating foreigners to key executive positions, and can be particularly more burdensome for SMEs.
"Employment pass
6.—(1)  Every application for an employment pass to be issued to a foreign employee shall —
(a)	be made — (i)	by the foreign employee; and (ii)	by the employer of the foreign employee, or on behalf of the employer by a person authorised by the employer;
(b)	be made in such form as the Controller may determine;
(c)	be accompanied by an undertaking from the employer or a sponsor of the foreign employee in such terms as the Controller may determine; and
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(3)  Every employment pass issued to a foreign employee shall be subject to —
(a)	the conditions set out in Part I of the Sixth Schedule and the regulatory conditions set out in Part II of the Sixth Schedule, being conditions and regulatory conditions to be complied with by his employer; and
(b)	the conditions set out in Part III of the Sixth Schedule, being conditions to be complied with by the foreign employee
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SIXTH SCHEDULE - CONDITIONS AND REGULATORY CONDITIONS OF EMPLOYMENT PASS […]
2.  The employer shall pay not less than the fixed monthly salary due to the foreign employee for the month. 
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PART II - REGULATORY CONDITIONS TO BE COMPLIED WITH BY EMPLOYER OF FOREIGN EMPLOYEE ISSUED WITH EMPLOYMENT PASS [...]
2.  An employer who intends to reduce the fixed monthly salary of the foreign employee, below that of the fixed monthly salary as declared in the work pass application, shall submit a request to the Controller for reassessment of the foreign employee’s work pass eligibility, prior to such salary reduction.[...]" (Employment of Foreign Manpower (Work Passes) Regulations – Conditions of Work Pass 2012, as amended)
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"Eligibility for Employment Pass
Only eligible candidates will be considered for an Employment Pass. Criteria include earning a salary of at least $5,000, which is benchmarked against the top one-third of the local professional, managers, executives and technicians (PMET) salaries by age. Use the Self-Assessment Tool to check a candidate’s eligibility before you apply.
Who is eligible
The Employment Pass is for foreign professionals who:
-Have a job offer in Singapore.
-Work in a managerial, executive or specialised job.
-Have acceptable qualifications, usually a good university degree, professional qualifications or specialised skills.
-Earn a fixed monthly salary comparable to the top one-third of the local PMET workforce by age, as shown below: [...]" (Singapore Government, "Eligibility for Employment Pass", Ministry of Manpower, website content)
Employment of Foreign Manpower (Work Passes) Regulations – Conditions of Work Pass 2012, as amended
Singapore Government, "Eligibility for Employment Pass", Ministry of Manpower, website content.
[<a href="https://www.mom.gov.sg/passes-and-permits/employment-pass/eligibility">Other</a>],[<a href="https://www.osborneclarke.com/insights/work-pass-requirements-tightened-non-singaporeans/">Other</a>]