Just as it is a mitzvah, when faced with a choice of stores —
Jewish-owned versus gentile-owned — to patronize and give one’s
business to the Jew, so too, when a Jew is in need of employment,
but a non-Jew will cost the employer less, it is incumbent upon
the Jewish employer to hire the Jewish employee, albeit for the
higher cost, and that additional cost may be treated as Tzedakah.
(Teshuvos V’Hanhagos 2:477)