Trending @Wipro; Question: What is billable by time and effort?

There are also deal types where customer asks for specific number of people. It's like body shopping.

Probably, you are asking about Time and Material (T&M) billing type- its one of the methods of how wipro is going to charge customers for people provided, its on actual efforts for week/month basis on pre-decided per hour rates, there are many other billing types too like fixed price or fixed capacity, where resource leaves doesnt matter and wipro gets monthly amount as decided