Mercury in Capricorn usually manifests as a highly structured and disciplined communication style. They speak carefully, preferring to develop their thoughts before delivering them. This particular Mercury often means proclivity to logical processing and problem-solving. It can manifest in an extremely serious or practical expression of ideas. This native likely naturally gravitates towards giving instructions or explaining things in full. Such people excel in fields that require them to be clear and precise in their communication, for example, management or administration, or any job where you need to be attentive to detail. As well, this placement can sometimes indicate a somewhat reserved communication style. They are not particularly outwardly expressive and are careful with their words. They demand respect, and you should as well. Unfortunately, it often makes them feel a bit distant and aloof, for a lack of emotiveness in their communication. However, it is primarily their strong sense of responsibility and efficiency.