I'm planning to apply for US's PhD program in Political Economy, and a writing sample of maximum 20 pages is part of the application requirements. The problem is I don't think that I have any recent high-quality writing to submit. I didn't write a thesis for the B.S. as my university didn't have that kind of requirement. I've been working for an international research center, but most of my works are mostly applied econometrics and I didn't really get to do any writing.
Bottom line is my writing sample will most likely be the weakest link in my application. If so, how bad will it hurt my chance? Is there anyway to get around this?