Why might developing countries have only primary and secondary economic activites?

Developing countries often have primary and secondary economic activities due to limited access to technology, capital, and infrastructure, which hinders the growth of tertiary (service-oriented) sectors. Their economies typically rely on agriculture, mining, and manufacturing, which are easier to establish without extensive resources. Additionally, a lack of education and skill development can restrict the workforce's ability to engage in more advanced service industries. Consequently, these nations may remain focused on basic economic activities that can generate immediate employment and income.