Top feeders to Economics Ph.D. programs, per capita:

1. Pomona College
2. Swarthmore College
3. University of Chicago
4. Williams College
5. Soka University of America
6. Carleton College
7. Claremont McKenna College
8. Colby College
9. MIT
10. Cal Tech
11.Stanford University
12. Wellesley College
13. Yale University
14. Macalester College
15. Harvard University
16. Whitman College
17. Reed College
18. Princeton University
19. Grinnell College
20. New College of Florida

https://www.collegetransitions.com/dataverse/top-feeders-phd-programs#econ

The lists continues through the top 50, so it would provide a range of reaches, targets, and safeties.

UChicago for God's sake.

Any college with an econ dept will do. You get experience in internships