Special Report: How gaming Libor became business as usual

``The problem with the CME's plan, as Engel saw it: The banks that set the rates in London daily were also able to take positions in the CME's Eurodollar contract. In her letter to the U.S. Commodity Futures Trading Commission, she said tethering the futures contract to Libor "might provide an opportunity for manipulation" of the interest rate. A "bank might be tempted to adjust its bids and offers ... to benefit its own positions."''