Just as the leading Hollywood studios gained from sound in relation to their foreign competitors, they did the same at home. As historian Richard B. Jewell describes, "The sound revolution crushed many small film companies and producers who were unable to meet the financial demands of sound conversion." The combination of sound and the Great Depression led to a wholesale shakeout in the business, resulting in the hierarchy of the Big Five integrated companies (MGM, Paramount, Fox, Warners, RKO) and the three smaller studios also called "majors" (Columbia, Universal, United Artists) that would predominate through the 1950s. Historian Thomas Schatz describes the ancillary effects: