“Caste is no longer an economic restriction,” said Viktoria Hnatkovska, an assistant professor of economics at the University of British Columbia, and a co-author of several studies on the changing role of caste in India.

Nonetheless, quotas have transformed the taint of “backwardness” into a coveted designation.

The Gujjars of Rajasthan, for instance, held violent riots two years ago to protest the government’s refusal to declare them as “most backward.” Politicians win elections in India by promising to bestow this one-time curse, which has led to a dramatic expansion in those considered backward decades after the designation had true economic meaning.

Indeed, caste awareness among the young is sustained in part because of set-asides, so a program intended to eliminate the caste system is now blamed by many for sustaining it.

“When I was filling out my college application forms, there was this box for caste,” said Sneha Sekhsaria, 25, of Calcutta. “I had to ask my dad what our caste was, and he had to think about it for 15 minutes before telling me that we were in the general category.”

The general category meant that she received no preference, a fact that Ms. Sekhsaria blames for her failure to qualify for medical school. She went to dental school instead.

“Being a doctor was always my dream, but I got a dental degree instead and that’s O.K.,” she said.

But she remains bitter that some of her friends who scored more poorly than she did on entrance exams were able to become doctors even though she and others in her circle were entirely unaware that they were “backward.”

Nonetheless, the benefits that flow from caste quotas have made them popular, and supporting them is one of the few issues on which the present government and its opposition agree. Within the next few months, the Indian Parliament is expected to overwhelming approve a constitutional amendment that would allow caste-based quotas not just in educational settings and in government hiring but also in government promotions.