The Hollywood film industry reached its zenith in productivity, profitability and popularity at the end of WWII. The studios collectively enjoyed their most lucrative year in 1946, with gross earnings reaching 1.75 billion dollars. In the closing years of the decade, organized labor won wage increases of 25% through protracted strikes. Overseas markets imposed substantial taxes on Hollywood films. Studios reacted by cutting expenses on film production and ordering mass layoffs. Historians Higham and Greenberg describe the qualitative impact on Hollywood films: