; (ii) the health of participating eligible individuals; and (iii) the social costs of income volatility, including connections with income fluctuation and health, housing, education, employment, childcare, and other outcomes as determined appropriate by the Secretary; and (B) the feasibility of expanding the program under section 3 to include a larger number of participants; and (2) the results of interviews and focus groups conducted with consenting participants of the program. 5. Definitions In this Act: (1) Commissioner The term Commissioner means the Commissioner of the Internal Revenue Service. (2) Eligible individual The term eligible individual means an individual taxpayer between the ages of 18–65. (3) External partner The term external partner means a non-partisan research agency or a non-profit academic institution with expertise in social science experimentation. (4) Fair market rent The term fair market rent means the applicable fair market rent established under section 8(c) of the United States Housing Act of 1937 ( 42 U.S.C. 1437f(c) ). (5) Secretary The term Secretary means the Secretary of Health and Human Services. 6. Authorization of appropriations There is authorized to be appropriated to carry out this Act $495,000,000 for each of the fiscal years 2024 through 2028.