N0 and HaKatan, I disagree with you. A rav can give his hashkafa on some Torah issue (and there is no one “right” hashkafa = all are divrei Elokim chaim). However, he cannot give an opinion, for example, the 1619 Project, unless he has studied the relevant secular fields.
As for the topic at hand, The Netziv says *He’emek Devar Devarim 17:15) that the Torah leaves the political system to the people. Rav Chaim David haLevy , who was certainly a gadol as well, says that the Torah does not require any particular economic system
(במוצאי שנת השמטה: המשטר החברתי התורתי מול הקפיטליזם והסוציאליזם”, קול סיני ה, תשכ”ו, עמ’ 251-245). but leaves it up to the people to decide how to achieve goals. Certainly, neither Halacha nor Haskafa can be referenced to decide decisions of central banks, for example
Rambam says at he beginning of the Guide that one can and should learn how to think by
studying secular fields. He himself learned from non-Jewish thinkers. Accept the truth from whomever says it (intro. to Shemoneh Perkaim). Both Rabbenu Bachaya and the Gra say on the third chapter of Pirkei Avot that a person cannot be considered a sage if he does not know secular fields .