For example, University of Cambridge economist Ha-Joon Chang defines the 9 main schools of modern economics as

1. Classical

2. Neoclassical

3. Marxist

4. Developmentalist

5. Austrian

6. Schumpeterian

7. Keynesian

8. Institutionalist

9. Behavioralist

With behavioralism obviously being one of the newest. Anyways if you'd like to read more about contemporary impact of Marxian economics:

https://mronline.org/2020/09/15/contemporary-relevance-of-ma...