Pension plans in the private sector were first introduced in the late nineteenth century. It was not until after World War II, however, that CIO unions popularized them. Between 1950 and 1979, private sector coverage more than doubled, but the 1980s saw a reversal of this trend. Today, private sector coverage is about 90 percent for state and local government workers and 100 percent for federal employees. a) Define Defined Contribution Retirement Plan in terms of benefits, vesting and common users. b) Define Defined Benefits Retirement Plan in terms of benefits, vesting and common users. c) Define vesting. How did EIRSA change vesting procedures? d) What problems could result without vesting privileges? e) What are the advantages of fringe benefits (in general) vs. wages to (i) union leaders, (ii) management, and (iii) workers?