<p>The very first thing you have to ask yourself is why you really want to obtain a PhD in any subject, including what specifically you plan to do afterwards. Suffice it to say that a PhD program in a social science at a top school such as Harvard is designed to place graduates into academia, with perhaps a minor contingent heading for governmental policy/regulatory positions such as the Federal Reserve. If those careers are not of interest to you, then you’re probably better off doing something else rather than a PhD, for without the desire to garner those types of jobs, you run the significant risk of not even graduating at all - lots of Harvard PhD students never finish the degree - and even if you do, the social pressures within the program to conform to those jobs will mean years of lonely existence. </p>
<p>Given that you do want an economics PhD, the next question to ask yourself is why exactly you want to pursue such a degree at a business school rather than a pure economics department - not only why your work fits within the business school environment, but more importantly, why that environment fits you. While you haven’t stated what your research interests are, if you plan to pursue the aforementioned economic history project further, you are almost certainly better off doing so in a pure economics program, as very few business schools have a strong economic history contingent. Business schools are interested in specific sub-branches of economics, and if you don’t care about those branches, then you would be better off not being there. I am increasingly convinced that many HBS business economics PhD students - which is the HBS joint economics program - would have been far better off in other programs, such as the pure economics program or perhaps one of the KSG programs. Generally speaking, it is better to avoid joint programs such as the HBS bus-ec program without an excellent reason, as joint programs impose more requirements that may prove difficult to fulfill. For example, the bus-ec PhD students must have at least one committee advisor come from the business school and another from the pure economics department, whereas the economics PhD students only need to have one advisor from the economics department and the others can be from anywhere at Harvard, or even another school entirely such as MIT or BU. </p>
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<p>That depends on the quality of the journals. Frankly speaking, as an undergrad, your chances of authorship of a paper at a top journal are very low simply due to the exceedingly high selectivity of those journals; there are junior economics faculty at top schools such as Harvard and MIT who still have zero publications in any journals, much less a top journal(!). {As a case in point, Gregory Lewis, who placed in the Harvard economics department in 2007, still has zero publications. Not even one. Eric Chaney, who placed in 2008, has only one publication in a lower-level journal.} </p>
<p>Now obviously if you happen to be one of the tiny handful of undergrads who can obtain authorship credit in an A-level economics journal, then your application will be vastly enhanced. I simply wouldn’t hold my breath, when even many faculty at the top schools lack such publications.</p>
<p>On the other hand, authorship credit in a low-level journal won’t help you much. Many such journals exist, most with low publication standards, and their perceived value within the academic community is therefore minimal. I suspect they’re actually worse than having no publications at all, because of the option value: an unpublished working paper might still someday be published in a top journal after sufficient editing, but one that is published in a low-level journal can never be republished in a top one. </p>
<p>The bottom line then is, more important than having published papers in low-level journals is to have unpublished but intriguing working papers that you can leverage as an admissions fillip. You will inevitably be asked what your research interests are, and that’s when you can start talking about your working papers and how they might somebody be converted into A-level publications.</p>