...S&P Global Ratings assigned its '##' rating to Jefferson Parish School Board, La.'s series 2018 0.5% sales tax school bonds, and affirmed its '##' rating on the board's parity sales tax debt. At the same time, we affirmed our '##' rating on the board's series 2010 sales tax bonds, which are secured by a 0.25% sales tax. The outlook is stable. The rating reflects our opinion of the board's: + Service sector-based economy, anchored in retailing, tourism (helped by the parish's access to New Orleans), and health care--these activities have diversified the parish's traditional base in shipbuilding and oil and gas; and + Maximum annual debt service (MADS) coverage of 4.59x. The rating is somewhat constrained by what we consider the board's 1.33x MADS additional bonds test (ABT). The board's 50% portion of a parish-wide 1% sales and use tax, which the electorate authorized in perpetuity at elections held in 1954 and 1971, secures the series 2018 bonds. The series 2018 bonds are on parity with...