When it comes to picking Core classes, Harvard students tend to be risk averse.

Preliminary figures show that last fall's two most popular courses, Social Analysis 10, "Principles of Economics" and Moral Reasoning 22, "Justice," have taken the top slots again this year.

Social Analysis 10, usually called Ec 10, has 805 students this year, according to preliminary course enrollment numbers released by the Office of the Registrar last week. Justice is a close second with 754.

Judith A. Li, an assistant professor of economics who teaches Ec 10 along with Baker Professor of Economics Martin S. Feldstein '61, says that despite the class's large lecture size, most of the basic skills introduced in Ec 10 are taught in smaller sections of about 20 students.

"Our goal for the course is to provide students with a solid and comprehensive foundation in economics," Li wrote in an e-mail message. "By taking a course like Ec 10, they will be better able to evaluate government policies and political proposals on their own."

The course is particularly popular among first-year students, many of whom are considering economics as a potential concentration.

"I really enjoy the lectures," Leah E. Wahba '04 said. "It's an honor to be in Marty Feldstein's class because he has so much extensive experience in the field of economics."

Students in Justice also said that lectures are their favorite facet of the course.