Final answer:
Third-party contractors are ideal for routine and non-core activities, enabling businesses to concentrate on their core competencies and main services or products.
Step-by-step explanation:
Third-party contractors are best used for routine and non-core activities. This practice allows businesses to focus on their core competencies, the areas of greatest expertise or strategic value that are critical to a company's long-term success. By outsourcing non-essential tasks, companies can allocate more resources and attention towards their main products or services, thereby enhancing quality and efficiency within their core operations.