Step 1: Understanding physical capital.
Physical capital refers to man-made goods that are used in the production of other goods and services. Examples include machines, buildings, tools, and raw materials used in production processes.
Step 2: Examples of physical capital.
Machinery, raw materials, and buildings are tangible assets used directly in production activities. They help increase productivity and efficiency in industries and businesses.
Step 3: Human capital concept.
Education and knowledge possessed by people are not physical objects but skills and abilities. These are categorized as human capital rather than physical capital because they enhance the productivity of individuals.
Step 4: Conclusion.
Therefore, education and knowledge in people represent human capital, not physical capital.
Final Answer: Education and knowledge in people.