Analysis of 126 public pension plans by the National Association of State Retirement Administrators shows an average target rate of 7.68%. New York State Common Retirement Fund, third largest by assets, says it plans to drop the assumed rate of return to 7% from 7.5%. A drop of 1% boosts pension liabilities by about 12%, accoridng to the Centre for Retirement Research at Boston College. It means workers are required to contribute more to the pension funds for the same level of benefits, especially as lifespans grow and more Americans retire in an aging population. Other options are for states to cut payrolls and expenses. This is a positive step as it makes the assumptions realistic and improves the fiscal stability of the funds. The largest pension fund, California Public Employees Retirement System is considering dropping its assumption to below the current level of 7.5%. The lower assumed rates of return are not enough say critics, who cite the 3- 3.5% returns assumed in the 1960's for cash and bond based portfolios. The Laura and Arnold Foundation's Josh McGee says it is still not realistic. Retirement systems median actual return was 3.4% for 12 months ending June 30, 2015. Expert panel of actuaries and pension specialists says the right level for assumed returns is about 6.4%. Companies in the Fortune 1000 have already dropped the figure to 7.1%, from 9.2% in 2000, according to Towers Watson survey....