Some guessing on my part, but MIT and Stanford not only have highly regarded economics programs, but are also schools in the thick of the technology explosion. Your roommate might be the one you would like to team up with. Admission would be very difficult for anyone at theses schools.
There is another option often overlooked.
If entrepreneurship is really your goal, you might want to consider a college which focuses exclusively on this subject. The class profile at Babson college is strong (see http://www.babson.edu/admission/undergraduate/class-profile/Pages/default.aspx) and they share a campus with a very creative engineering school (Olin college of engineering, see http://www.olin.edu/admission/), but the only undergraduate Babson major is entrepreneurship. Olin is only for engineering majors and has a more selective and separate admissions process).
Entrepreneurship is not the same as an economics major. Graduate school would most likely be for an MBA
Largely,because of the size of these schools, they are not well known to the general public. It would be an education for you to check them out.
I was an economics major from an engineering college who went on to graduate school in economics. Silicon Valley did not exist at that time! Unless you want a PhD in economics, you might find the entrepreneurship route more appropriate. :bz