sentences:  Sachs explains that countries, like patients, are complex systems, requiring differential diagnosis, an understanding of context, monitoring and evaluation, and professional standards of ethics.Clinical economics requires a methodic analysis and "differential kapay" of a country's economic problems, followed by a specifically tailored prescription.Many factors can affect a country's ability to enter the world market, including government corruption; legal and social disparities based on gender, ethnicity, or caste; diseases such as AIDS and malaria; lack of infrastructure (including transportation, communications, health, and trade); unstable political landscapes; protectionism; and geographic barriers.