preferentialist
/ˌprɛfəˈrɛnʃ(ə)lɪst/ /ˌprɛfəˈrɛnʃəlɪst/Economics
noun
An advocate of the system of preference; especially (in Britain and the Commonwealth) an advocate of the system of imperial preference (now historical ).
Origin
Early 20th century; earliest use found in The Times. From preferential + -ist.