Federal Judge Stephen Bough granted final approval Tuesday for the Chicago-based National Association of Realtors $418 million settlement agreement to resolve litigation against the organization and its members brought on behalf of home sellers related to broker commissions. He granted preliminary approval of the agreement in April. The payout comes after a Missouri federal jury issued a landmark $1.8 billion verdict in October of last year, finding the National Association of Realtors and several large real estate brokerages conspired to artificially inflate commissions on home sales.