When a secular government is deciding what laws to put in place, just as you would not advocate for them banning the sale of cheesburgers, you shouldn’t advocate for them adopting the Gemara’s rules on monetary issues.
I’m not sure I agree with this. The Torah certainly holds that one must have the “Eipha Tzedek” as stated in the Torah. There also needs to be a system of Dinim and a system of taking care of the poor. The tannaim would “break the market” if needed to allow neccesities to be affordable (see: Rabban Gamliel & Kinim).
That is not to say that we should all start being Marxists. There is a medium between Rand (who promotes pure Middas Sedom) and Marx (who promotes what the Mishna in Avos 5:10 calls “am HaAretz”), and the question is where that is. Certainly intervention to protect the consoumer in under the catagory of “Eipha” and IMHO is a chiyuv on all Beni Noach (as part of Dinim). Go from there.