*In the original formulation of the ARRC's Paced Transition Plan set out in the ARRC's 2017 Second Report, there had been six steps, with a Step 4 that involved CCPs providing a choice between SOFR and EFFR PAI and discounting environments for new trades (by 2020 Q1), and a Step 5 in which the CCPs would move to only offer a SOFR PAI and discounting environment for new trades (by 2021 Q2).与利益相关者协商,CME和LCH随后确定,在当前步骤4中概述的模型是合适的,涉及从EFFR到SOFR PAI的立即切换,并在10月2020年10月2020年清除的新贸易和遗产的单一步骤中进行打折。