Revenues have been affected by the introduction of new products with higher margins; however, these innovations are often copied quickly by competing banks, pushing down trading margins. For example, brokerages commissions for bond and equity trading is a commodity business, but structuring and trading derivatives have higher margins because each over-the-counter contract has to be uniquely structured and could involve complex pay-off and risk profiles. One growth area is private investment in public equity (PIPEs, otherwise known as Regulation D or Regulation S). Such transactions are privately negotiated between companies and accredited investors.