demand (n.)youdaoicibaDictYouDict[demand 词源字典]
late 13c., "a question," from Old French demande (see demand (v.)). Meaning "a request, claim" is from c. 1300. In the political economy sense (correlating to supply) it is attested from 1776 in Adam Smith.[demand etymology, demand origin, 英语词源]
mercantile (adj.)youdaoicibaDictYouDict
1640s, from French mercantile (17c.), from Italian mercantile, from Medieval Latin mercantile, from Latin mercantem (nominative mercans) "a merchant," also "trading," present participle of mercari "to trade," from merx (see market (n.)). Mercantile system first appears in Adam Smith (1776).
producer (n.)youdaoicibaDictYouDict
1510s, "one who produces;" agent noun from produce (v.). Of entertainments, from 1891; in political economy, opposed to consumer, from 1784 (Adam Smith).