The Third Circuit held that where an employer has been party to multiple collective bargaining agreements (“CBAs”) with a multiemployer fund, an employer’s withdrawal liability should be based on “the single highest contribution rate” established under the CBAs.  In so ruling, the Court observed that ERISA requires annual withdrawal liability payments to be based on “the highest contribution rate at which the employer had an obligation to contribute under the plan,” and rejected the employer’s argument that a “weighted average” of the contribution rates should apply.