Considering double major in Economics and Business admin.HBS 2+2 ?

<p>So, I am considering doing Economics and Business admin.Do I qualify for the HBS 2+2 program ?I know people doing business majors are not encouraged to apply, but does taking Economics as well changes things l ?What if I do ECO and IR instead of ECO and BUS ?Is this better not only for the HBS 2+2 program but also for the MBA application process in the future ?
Also, I am considering enrolling in summer school at Cambridge university.I will take some political science and international relations courses.The school continues for 6 weeks.Do you think that will help me get into the HBS 2+2 program if I do well, of course ?</p>