Proportional Merit
We can speak of an “efficacy” to “the merit and intercession of Jesus Christ” (WCF 17.2). His work was meritorious because it was proportional.
Orthodox Presbyterian Church. “Report of the Committee to Study Republication.” Presented to the Eighty-third (2016) General Assembly. Accessed February 9, 2021. https://www.opc.org/GA/republication.html