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 (-5[1])of this quantity. (15[1])A London-based index for this quantity (15[1])that was (15[1])discontinued in June 2023 following its namesake scandal in 2012 was named Libor. In one model, (15[1])output increases as this quantity decreases along the (*) investment-saving curve. Two forms of this quantity are related to the rate of inflation (-5[1])in the Fisher equation, (10[1])where the real (-5[1])form of this quantity (10[1]-5[1])approximately equals the nominal form minus inflation rate. Decreasing this quantity close to zero results in the (0[1])liquidity trap. For 10 points, identify this quantity, the so-called cost of borrowing money. ■END■ (10[2])