Mumbai: The cement industry in India is in a "sweet spot", said market leader UltraTech Cement's chief, optimistic that prices will continue to improve in the next few months. The Aditya Birla Group company on Monday reported a 21% year-on-year increase in profit for the September quarter."In a normal year, cement prices slip during July and August as rains slow site (work) and dealers chase volumes," chief financial officer Atul Daga said.