Why might developing countries have only primary and secondaryeconomic activites?

Developing countries may primarily engage in primary and secondary economic activities due to limited access to technology, capital, and infrastructure, which restricts their ability to advance to tertiary activities like services. Their economies often rely on agriculture and raw material extraction (primary activities) and basic manufacturing (secondary activities) to drive growth. Additionally, educational constraints may lead to a workforce that is less skilled in service-oriented industries. Consequently, these nations focus on leveraging their Natural Resources and labor-intensive production to stimulate economic development.