meera, quality is an aggregate value. It is something that makes a women desirable. Like a lot of social science index, it can be vague. This definitely is not ,being Dr alone , or being a rich father's daughter alone. Notice that quality index lowers as age progresses. Of course, thoughts like these sound callous and rebellious, and even to some extent demeaning to women, but these thoughts are designed to understand the society in terms of theories of social science. Hope that answers your question.