under the provisions of such Act in effect after December 1978). . (d) Rule of construction This section and the amendments made thereby shall not be construed as a general benefit increase for purposes of section 215(i) of the Social Security Act (and section 215(i) of such Act as in effect in December 1978 and applied in certain cases under the provisions of such Act in effect after December 1978). (e) Effective date The amendments made by this section shall apply to determinations made with respect to base quarters ending on or after September 30 of the second calendar year following the calendar year in which this Act is enacted.