http://www.nasra.org/level2/dbvsdc.html Some selected excerpts from this link, which is directly on topic to DB vs. DC:
DB vs. DC - Who Rules?
An Interview with Leslie Finertie (Towers Perrin)
Defined Benefit vs. Defined Contribution retirement systems is one of the "hottest" topics in public sector retirement systems. The vast majority of public retirement systems are DC, which may explain the many apparent misconceptions about DB.
The 1997 PENDAT Survey indicated that the median employer retirement contribution to a DB plan for general employees was between 10 and 14 percent of covered payroll. What might be the comparable contribution to a DC plan?
Finertie: Studies show if you try to keep employees whole when they transfer from a DB to a DC plan, contributions have to increase by 50 percent or more of payroll for employees over age 40. Or, with the same contribution rate to a DC plan, the average investment return needs to increase to 15 percent or more, annually for life.
Recent studies show that about half of terminating employees eligible for a lump sum spend that money rather than roll it over for retirement. It's hard for a 30-year-old to realize that if they spend the $5,000 to $10,000 they've saved so far, it will make a big impact on their retirement account in 30 years.
Many public retirement system directors have expressed the fear that a substantial number of people under a DC plan will end up at the age of normal retirement without an adequate benefit to supplement Social Security. Is this a valid concern?
Finertie: Everyone should be concerned about the adequacy of retirement benefits for employees switching to DC plans. Social Security alone may not keep retirees out of poverty. So, employees may need to work well into their 60s to accrue enough benefits in a DC plan. Individuals may look at the large DC account balance and retire at age 50 or 55 thinking they have enough money. But what if they run out of funds by about age 65 when Social Security payments begin? Will they be in good enough health to go back to work after being retired for 10 years or longer? Who will pick up the shortfall when these retirees can cover their own living expenses?
Do you think that DB vs DC will continue to be a big public sector issue in the coming years?
Finertie: The DB vs DC debate will rage on. So many organizations marketing 401(k) and similar types of DC plans will continue to focus on their advantages. DBs will continue to remain difficult to understand. And, we will continue to have generational differences with younger employees preferring DCs because of their portability. Also, as employers begin to need employees to work for more years because of the emerging skilled labor shortage, employers may want DCs which don't encourage early retirement because they don't include early retirement subsidies.