Taves estimates that half of the films produced by the eight majors in the 1930s were B movies. Calculating in the three hundred or so films made annually by the many Poverty Row firms, approximately 75 percent of Hollywood movies from the decade, more than four thousand pictures, are classifiable as B's. Outside of the highly standardized realm of the series picture, studio executives saw developmental opportunities in their B lines of production. In 1937, RKO production chief Sam Briskin described his company's B films as "a testing ground for new names, and experiments in story and treatment."