Is jati a social system or a social structure?
Is there a system of jati in India?
This question is ambiguous because it is unclear what ‘system’ means in this context. It could mean many things. This question, therefore, can only be answered when someone tells us what a social structure or social system is. There are many senses in which these terms (‘system’ and ‘structure’) are used: one speaks of democratic structures of a polity, social structure of a Feudal society, the Capitalist social system, kinship and family structures, the system of nuclear family, and so on. Given this plurality of uses, it becomes necessary to specify very clearly the sense in which the jatis are not only a system but also a social system.
Do all the jatis, together, form a ‘structure’ of sorts?
Again, the issue is what this structure is: mathematical structure, logical structure, or whatever else. We do not know, because no one has specified what kind of structure jatis (in their entirety) are supposed to exemplify.