Liability indices: Methodology
The iBoxx US Pension Liability Index – Aggregate mimics the overall performance of a model defined benefit plan in the US, taking into consideration the passage of time and changes in the term structure of interest rates. The index is based on actual liability profiles, and mimics the investment grade yield curve. It is therefore more appropriate than most existing indices for measuring the performance of defined benefit plans. This index (along with its related active member and retired member indices) is published daily, using the LIBOR interest rate swap curve as the discount curve, a highly liquid universe. This provides the flexibility to use combinations of the indices in order to accurately represent customized liability profiles based on a plan’s specific participant population.
Pension Protection Act (PPA) liability returns are approximated by the Barclays Capital US Long Credit A-AAA Index. This index broadly reflects the duration and credit characteristics of the PPA discount curve that is used to discount expected pension benefit payments for US defined benefit pension plans.
Asset index: MethodologyUBS Global Asset Management approximates the return for the ”typical” US defined benefit plan using the reported asset allocation of the UBS Global Asset Management Pension 500 Database. The series is constructed using the aggregate asset allocation weightings and publicly available benchmark information, with geometrically linked monthly total returns. Pension Fund Fitness Tracker: Methodology The US Pension Fund Fitness Tracker is the ratio of the asset index over the liability index. Assuming all other factors remain constant, it combines asset and liability returns and measures the impact of a “typical” investment strategy on the funding ratio of a model defined benefit plan in the US due to interest rollup, change in interest rates and typical asset performance, but excludes unique plan factors, such as service cost and benefit payments.
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