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Your statement of purpose
The statement shows a committee that you know what you want to study and that their program is the right place to do it.
The statement of purpose is where you show a committee that you understand what economic research is, that you know what you want to study, and that their program is the right place to study it. It is not a life story, and it is not a summary of your CV.
What committees want to see: fit
Programs want to know that you know what you want to do, and that their school is a genuine match. The strongest statements connect your past, your plans and their faculty in a single line of reasoning. Here is the shape of a statement that does this well:
The shape of a strong statement
“I did research with Professor X on health insurance and took two courses in health economics. I am applying to Y University to work with Professors A and B, whose research on [topic] connects directly to the questions I want to study on [topic]. Because their work uses data and methods similar to those I worked with, I can see myself contributing to and building on their research.”
A paragraph like that shows maturity and readiness better than anything else in the application. It tells the committee that you have done research, that you know the field, that you have read their faculty’s work, and that you have thought about where you would fit.
Structure
Open with your research interests
Start with one or two specific questions you want to study, not with how long you have loved economics.
“Ever since my first economics class, I have been passionate about understanding how the world works.”
“I want to understand why small changes in eligibility rules lead families to drop out of benefit programs. As a research assistant, I worked on exactly that question using administrative data.”
Show your evidence
Describe your research experience: what you did, what you learned, what went wrong and how you handled it. Be specific about your own contribution. If you have strong work experience, explain what it prepared you to do as a researcher.
Explain why this program
Name two to five faculty members whose work connects to your questions, and say how. Mention relevant research centers or data resources. Tailor this part to every school; committees can tell immediately when it is generic.
Address weaknesses briefly
If there is something a committee will wonder about, such as a weak semester or a late start in mathematics, address it in one or two sentences, explain what changed, and move on.
What to avoid
Flattery of the program. Vague passion. Restating your CV. Claiming a finished dissertation plan; committees know your interests will change, and they want to see that you can think like a researcher, not that you have already decided everything. And above all, a statement that could be sent to any school.
Practical details
Keep it to one or two pages, or whatever length each program specifies. Write several drafts. Have an economist read it before you submit it, ideally one of your letter writers, so their letter and your statement tell a consistent story.