What is the importance of human behavior?

well, it could b manifolds ranging from making money out of it or finding cures for diseases(ailments of brains to b more specific). As to the former it finds use in making retail strategy, branding of products, look n feel etc etc. To the latter end, its extensivly being used by psychiatrist worldwide for ailments like somnambulism. Well, guess wut its just d tip of d iceberg i hav dealt into....google arnd for more.