THE first part of SEBI's investigations deal with the carry forward charges. A broker commits to buy, say, 10,000 SBI shares at the price prevailing on the day, and deposits the margin money. He's now supposed to pay up the rest and take delivery, or sell off the shares, before the designated settlement day. Now, if the price of the scrip hasn't gone up by a substantial amount within that settlement, brokers carry forward their transaction till the next settlement without paying either the money or delivering shares. The cycle goes on from one settlement to the other. The process is also used to rig prices and book profits. Sometimes, when delivery is insisted upon, brokers default on payment. While big brokers make a killing in such transactions, small investors suffer badly.