<p>Given your interests - and given that you want to be a researcher and pursue a PhD and a research career - I’d say that a basic liberal arts major in the physical sciences with some breadth is the best choice for you. Personally, given your interests, I would choose math or computer science with a minor in math.</p>
<p>My reasoning:</p>
<p>1) Math is a good foundation for literally anything, at least anything you are interested in. If you later decide you want to be an engineer, you can get an MS in engineering after taking a few prerequisites; if you decide you want to go into computer science, you have the mathematical part; if you decide that you want to go into economics, your mathematical/quantitative background will be useful. Even if you decided you wanted to go into the social sciences, mathematical modeling and quant methods are huge parts of that. Business folks value mathematics majors, too, because you can learn data mining and modeling of future risk and profit.</p>
<p>2) Being a liberal arts major, a math major will give you the leeway to take other classes in other fields. It’s a standard 40-hour major (as opposed to engineering). So it’ll make it easier to explore your interests in the humanities and social sciences.</p>
<p>3) At many schools, computational courses can count as “cognate courses” towards your major in math. So let’s say you’re a math major; once you take the calculus sequence and linear algebra - and maybe a class like set theory and transition to modern mathematics or whatever - about 3-5 of your electives can be from other departments. My husband is a math major at our Ivy, and as major electives in addition to the classes offered in the math department he can take CS, physics, astronomy, operations research, economics, and even a philosophy course in logic. The requirement is only that the class must require two semesters of calculus to count. That gives you even further leeway to explore.</p>
<p>4) If you’re not sure where your career or research interests lie just yet, but you know they require a lot of math and computational science and they’re in the physical sciences, math is an excellent major. It’ll give you that background. And most departments - from physical sciences to social sciences and even life sciences - value that one kid who knows more mathematically than everyone else.</p>
<p>Given your interests, though, you may want to take some basic biology courses (equivalent to a minor) and some basic economics courses (equivalent to a minor, or maybe a bit more). For the research you listed, doing a math major with minors in biology and econ will prepare you well. Assuming the math major is 40 credits and each minor is 20 credits, that’s 80 credits, but that still leaves you with another 40 credits (about 10 classes) of exploration.</p>