Yawning is highly contagious, even when reading or hearing about yawning. Marketers use this phenomenon of emotional contagion to subtly influence consumers. Undercover marketing disguises advertising as unbiased recommendations to avoid consumers realizing they are being marketed to. Corporations spend billions advertising directly to children and influencing their pestering of parents to make purchases. This targets children's insecurities and can contribute to issues like obesity, poor self-esteem, and financial problems later in life.