Final answer:
Human capital, physical capital, and technology are enhanced by education, innovation, and additional training, thereby contributing to economic growth.
Step-by-step explanation:
All three skills, human capital, physical capital, and technology, are enhanced through education, innovation, and investment. Higher education and refined skills lead to new technological innovations, which, when implemented in new physical capital (like machines and tools), improve production and efficiency. However, to fully utilize these technological advancements, additional training is necessary, which further builds worker skills and contributes to economic growth. This synergistic relationship ensures that the economy has all the necessary ingredients of the aggregate production function to succeed.