; and (4) provide technical assistance to local boards and employers participating in programs under this Act. (l) Payment (1) Advance payment The Secretary may provide a payment under this Act, as described in subsection (a), for a quarter on the basis of an advance estimate of expenditures submitted by the local board and any other investigation the Secretary may find necessary. (2) Retrospective adjustment The Secretary may reduce or increase a payment referred to in paragraph (1) for a quarter as necessary to adjust for any overpayment or underpayment resulting from such a payment in a previous quarter. (3) Reimbursement The Secretary may provide a reimbursement payment under this Act, as described in subsection (a), for a quarter on the basis of the actual expenditures of the local board, if payment has not already been made under this subsection for the same expenditure. (m) Mandatory funding For the purpose of carrying out this section, there is authorized to be appropriated and there is appropriated, out of any money in the Treasury not otherwise appropriated, such sums as may be necessary for fiscal year 2020 and each subsequent fiscal year. 5. Grants for high-poverty areas and areas with chronically low employment rates (a) Definitions In this section: (1) High-poverty area The term high-poverty area means an area in which the poverty rate, as determined by the Bureau of the Census, has been not less than 20 percent for a period of not less than 3 years. (2) Prime working-age employment-to-population ratio The term prime working-age employment-to-population ratio , used with respect to an area, means the ratio of the number of individuals age 25 through 54 in the area who are employed, to the number of individuals age 25 through 54 in the area. (b) Establishment The Secretary shall award grants on a competitive basis to local boards (including community-based organizations, consistent with section 4(d)(4)(D)), that carry out jobs programs described in section 4, to provide for added costs related to