Homo economicus; economic human
Economics term for the rational, self-interested decision-maker in theoretical models. Not a common everyday word.
In economics, humans are often assumed to be rational Homo economicus.
financial expert; businessperson
Refers to a person well-versed in economic or financial matters, or simply a businessperson. Less common than 経済の専門家 or 実業家 in everyday speech.
He is known as an outstanding businessperson.