Diwakar Gupta, MD and CFO of SBI tells NDTV Profit that the cushion to bring down rates is limited, despite policy rates having been lowered by 75 basis points so far this year. Be he says that the long term interest of the economy and banks remain in a lower interest rate regime. He also said that the impact of rising yields will be limited on SBI's bond portfolio, as and when we see a tapering of the Fed's stimulus