Actuarial Assumptions in Defined-Benefit Pension Plans

Which of the following statements concerning the various actuarial assumptions used in estimating an employer’s contributions to a defined-benefit pension plan is correct?

1. The higher the assumed rate of investment income, the larger the employer’s assumed contribution rate.
2. The higher the employee turnover or termination rate, the larger should be the employer’s assumed contribution rate.
3. The greater the expected impact of inflation on salary scales, the larger should be the employer’s assumed contribution rate.
4. Actuarial assumptions are usually so accurate that adjustments in the employer’s annual contribution rate are seldom necessary.