Simultaneously buying this quantity’s namesake caps and floors is known as this quantity’s so-called “collar” strategy. Indices for this quantity are often the underlying for a forward rate agreement. The TED spread measures the difference between two forms of this quantity. A London-based index for this quantity that was discontinued in June 2023 following its namesake scandal in 2012 was named Libor. (15[2])In one model, output increases as this quantity decreases along the (*) investment-saving curve. (10[1])Two forms of this quantity (10[1])are related to the rate of inflation (10[1])in the Fisher equation, where the real form of this (10[1])quantity approximately equals (-5[1])the nominal form minus inflation rate. Decreasing this quantity close to zero results in the liquidity trap. For 10 points, identify this quantity, the so-called cost of borrowing money. ■END■ (10[1])