I can think of three reasons why some fields might have higher grades than others: 1. The field is easier/has a lower "skill cap" (some business degrees might

I can think of three reasons why some fields might have higher grades than others: 1. The field is easier/has a lower "skill cap" (some business degrees might fit in here) 2.The people in the field are nice/particularly concerned with giving students positive feedback (based on stereotypes you'd expect this applies to women's studies) 3. The field isn't very prestigious and/or has low earning potential, so students don't go into the field unless they're very dedicated, so everyone in the classes works hard and performs at a high level (I could see this applying to pretty much everything on there above 75% As)