The business major does not allow courses (like Classics R44) to count for both R&C and 7-course breadth. Note also that business courses and micro/macro economics courses (1, 100A, 100B, 101A, 101B) are also not allowed for 7-course breadth in the business major.
http://www.haas.berkeley.edu/Undergrad/breadth_list.html
L&S (where the economics major is) does allow doubling up R&C and 7-course breadth (like with Classics R44) and does allow your major courses to count for breadth.
American cultures can be fulfilled by a course that fulfills other requirements (breadth or major).