Bentley is like a small business school, with a few other majors (some of which are business-adjacent):
The “quantitative” economics major is a moderate math (single variable calculus) economics major:
https://catalog.bentley.edu/undergraduate/programs/business-programs/quantitative-economics/
Since that major is contained in the business division, substantial business courses are also required.
If the student wants to go on to PhD study in economics and chooses Bentley, it may be better to study one of the math/statistics-based majors (mathematical sciences, actuarial science, or data analytics) and add the intermediate economics and econometrics courses as electives. Bentley does not offer real analysis (sometimes preferred by PhD economics programs), so that course may have to be taken through cross registration at Brandeis.