It can be argued that the caste system is equivalent to Ricardo's theory of comparative advantage (1817), but instead of looking at advantages in supply chain management, technology, logistics, etc., vedic astrology looks from the perspective of human personality traits, in the form of planets in signs in houses or nakshatras or both.
Considering that most people's birth chart is a mix of Deva/Manushya/Rakshasa, Artha/Dharma/Kama/Moksha, and Sattva/Rajas/Tamas, how can it be that any 1 person is purely Brahmin, Kshatriya, Vaisha, or Shudra?
What was the formula used to calculate this?