; plus (ii) an amount equal to a percentage of the amount determined pursuant to clause (i), which percentage is the percentage by which the retired pay of the member would have increased for the month, as described in subparagraph (A), if the member was alive (and otherwise entitled to such pay). (C) Rounding down The monthly amount of an allowance payable under this subsection, if not a multiple of $1, shall be rounded to the next lower multiple of $1. (D) Public notice on amount of allowance payable Whenever an increase in the amount of the allowance payable under paragraph (1) is made pursuant to this paragraph, the Secretary of Defense shall publish the amount of the allowance so payable by reason of such increase, including the months for which payable. . (c) Effective date The amendments made by this section shall take effect on December 1, 2018. D Other Matters 631. Rates of per diem for long-term temporary duty assignments (a) Report on cost-benefit analysis of November 2014 change of policy (1) In general Not later than 90 days after the date of the enactment of this Act, the Secretary of Defense shall submit to the Committees on Armed Services of the Senate and the House of Representatives a report setting forth an analysis, conducted by the Secretary for purposes of the report, of the costs and benefits of the change in policy of the Department of Defense on rates of per diem for long-term temporary duty assignments that took effect on November 1, 2014. The study shall be consistent with the principles and requirements of Office of Management and Budget Circular A–94. (2) Element assessing cost-benefit The report under paragraph (1) shall specify, in particular, whether or not the benefits of the change in policy described in that paragraph have outweighed and will continue to outweigh the costs of the change of policy. (b) Contingent reversion to prior policy (1) Lack of report If the report required by subsection (a)(1) is not submitted to the committees of Congress referred to in that subsection by