Which field of economics deals primarily with the problems faced by low-income countries?

Development economics

Explanation:

Development economics is a field which deals with the problems dealt by low-income countries and low-middle income countries. The focus of development economics is to solve the development problems by using economic tools and to push these low-income countries to start trade with developing or developed countries. Development economics gained popularity, especially after globalisation, because it provided low-income countries with an opportunity to interact with other countries.