; or (2) areas for which the prime working-age employment-to-population ratio has been low, relative to that ratio for the United States, for a period of not less than 3 years. (e) Modification of certain standards In awarding a grant under this section to a local board, the Secretary is authorized to modify 1 or more of the following standards for the program carried out by the local board, if the Secretary determines that making such a modification can be reasonably expected to help the program achieve the performance accountability measures referred to in subsection (c)(1): (1) The periods of time specified in subparagraphs (C) and (D) of section 3(2). (2) The limitation on the percentage or number of employees in program positions with a single participating employer, as specified in section 4(f)(4). (3) The allowable duration of funding for wages and compensation as eligible costs, for a program position, as specified in section 4(h)(2). (4) The limitation on eligible costs for supportive services and training services, as specified in section 4(h)(3). (5) The limitation on eligible costs for administration, as specified in section 4(h)(4). (6) The employer share of eligible costs for wages and compensation, as specified in section 4(i). (f) Evaluations The Secretary shall— (1) evaluate the performance of jobs programs that receive funding under this section; and (2) identify and publicize best practices used by local boards carrying out jobs programs that receive funding under this section, through the clearinghouse described in section 4(j)(5). (g) Authorization of appropriations There are authorized to be appropriated to carry out this section such sums as may be necessary for fiscal year 2020 and each subsequent fiscal year.