A movement is afoot to require public pension plans to calculate and publish their market value of liabilities, a figure akin to a plan's termination liability. MVL is determined by using a risk-free rate of investment return--generally around four to five percent--to discount liabilities, rather than a return based on a diversified portfolio, which is generally seven to eight percent; and the accumulated benefit obligation, rather than the pension benefit obligation, which projects future service and salary growth.  Corporate pension plans are required to calculate a MVL, chiefly so that in the case of bankruptcy or sale of the firm, the plan's liabilities are known. The Governmental Accounting Standards Board has issued an Invitation to Comment on its Statements 25 and 27, pertaining to the measurement and reporting of public pension liabilities. Possible changes to these standards may include elements of MVL; access information about the GASB ITC here.