Where does “mercatista” come from?

mercatista (Italian) comes from Italian -ista, from Latin -ista, from Ancient Greek -ιστής, from Ancient Greek -τής, from Proto-Hellenic -tās.

mercatista (Italian): marketist

Definitions

Step	Language	Word	Meaning
1	Italian	-ista	-ist
2	Latin	-ista	-ist; one who practises or believes
3	Ancient Greek	-ιστής	Alternative form of -τής; -ist
4	Ancient Greek	-τής	Appended to verbs to form agent nouns
5	Proto-Hellenic	-tās	—