Economics should really be in the same bracket as business. That bracket should be called "commerce". I studied both subjects and they have more in common with each other than economics does with politics, sociology, education, anthropology, theology, etc.

Social sciences, liberal arts, and humanities should be their own bracket. Visual and performing arts should be their own bracket.

Imo, the brackets should be:

1. STEM
2. Commerce, which comprises economics, business administration, accounting, marketing, HR, operations management, finance, etc.
3. Liberal arts, humanities, and social sciences. This would include history, geography, politics, philosophy, sociology, psychology, education, communications, foreign language, english literature, etc.
4. Visual and performing arts