Prejudice refers to unfavorable attitudes towards social groups, while discrimination involves harmful actions directed at those groups. A 1934 study found that while a Chinese-American couple faced little prejudice during visits to establishments, 92% of those places later said they would not accept Chinese guests. Prejudice can take the form of sexism, racism, ageism, and discrimination against homosexuals. It exists on a scale from antilocution to extermination. Prejudice leads to effects like stereotype threat and self-fulfilling prophecies.