If I see the orderbook of AFFORDABLE share it is trading in multiples of 1600? Why is it so?
That stock is part of BSE SME. This support page explains about those stocks -
The only thing different about stocks listed here is that they are traded in lots just like F&O. You cannot buy 1 share or any odd quantity. The lot sizes of each of these stocks are decided by the exchange. These stocks have to be traded only in multiples of their lot size. (*lot size can be found out by looking at the market depth on the exchange website)
The lot size of that particular stock is 1600 (BSE Notice)