The combination of firm-specific and valuable and firm-specific allows a company to possess a core competency.

Resources; productivity.

Explanation:

Core competency can be defined as the set of skills, experience and technical know-how, which an organization possesses and distinguishes them from their competitors (rivals) in the same industry. Basically, measuring the core competence of an organization is beyond its financial assets or physical value. Core competency of an organization is rather the defining capabilities and resources which gives it a competitive advantage over its rivals in the same industry.

Hence, the combination of firm-specific and valuable resources and firm-specific productivity allows a company to possess a core competency. A company that possesses core competence are characterized by;

1. They are not so easy to imitate or not imitable by their rivals in the industry.

2. They have a very large market capital share and as such are able to diversify.

3. A core competent company should be able to provide significant satisfaction or benefits to the consumers of its products.

b. take periodic breaks and alternate between tasks.  

will increase work efficiency, and avoid health issues.

answer; comparing the additional benefits and costs;