Within their first year at Columbia, the Stooges became very popular. Realizing this, Columbia Pictures president Harry Cohn used the Stooges as leverage, as the demand for their films was so great that he eventually refused to supply exhibitors with the trio's shorts unless they also agreed to book some of the studio's mediocre B movies. Cohn also saw to it that the Stooges remained ignorant of their popularity. During their 23 years at Columbia, the Stooges were never completely aware of their amazing drawing power at the box office. Their contracts with the studio included an open option that had to be renewed yearly, and Cohn would tell them that the short subjects were in decline, which was not a complete fabrication (Cohn's yearly mantra was "the market for comedy shorts is dying out, fellas"). The Stooges thought that their days were numbered and would sweat it out each year, with Cohn renewing their contract at the last moment. This deception kept the insecure Stooges unaware of their true value, resulting in them having second thoughts about asking for a better contract without a yearly option. Cohn's scare tactics worked for all 23 years that the Stooges were at Columbia; the team never once asked for a salary increasenor were they ever given one. It was not until after they stopped making the shorts in December 1957 that Moe learned of Cohn's tactics, what a valuable commodity the Stooges had been for the studio and how many millions more the act could have earned. Columbia offered theater owners an entire program of two-reel comedies (15–25 titles annually) featuring such stars as Buster Keaton, Andy Clyde, Charley Chase and Hugh Herbert, but the Stooge shorts were the most popular of all.