With the production code abandoned and violent and disturbing films like Romero's gaining popularity, Hollywood opted to placate the uneasy filmgoing public with the MPAA ratings system, which would place restrictions on ticket sales to young people. Unlike the production code, this rating system posed a threat to independent films in that it would affect the number of tickets they could sell and cut into the grindhouse cinema's share of the youth market. This change would further widen the divide between commercial and non-commercial films.