It has factual errors. It has inadequate references. It effectively develops ideas with examples and details. It has no significant sentence structure or grammar problems. It has varied sentence structure and it reads fluently.
Paragraphs are unified and coherent.
It has a clear, sharp thesis or organizing idea. It uses economic principles correctly. Its references are from a variety of sources. It fulfills the requirements thoroughly and interestingly. It develops ideas in a full and satisfying way.