Marie comes from a supportive, loving family and has a stable socio-economic background. She has developed depression due to a serotonin deficiency. Anne has distant parents, failing grades, and insufficient funds for basic necessities and also develops depression. These two cases demonstrate what principle of developmental psychopathology

Equifinality is the principle that in open systems, a particular end state can be attained through a variety of possible routes.
Hans Driesch, a developmental biologist, coined the name and concept, which was later adopted by Ludwig von Bertalanffy, the inventor of general systems theory, and William T. Powers, the founder of perceptual control theory.
In defining the same or convergent behavior of complex systems, Driesch and von Bertalanffy choose this term over "goal."
Powers simply emphasized response flexibility, emphasizing that the same end state can be attained via a variety of paths or trajectories.

Therefore, in the given situation Marie is, the two cases demonstrate the Equifinality of developmental psychopathology.

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