An economist is a professional in the social science discipline of economics. The individual may also study, develop, and apply theories and concepts from economics and write about economic policy. Within this field there are many sub-fields, ranging from the broad philosophical theories to the focused study of minutiae within specific markets, macroeconomic analysis, micro-economic analysis or financial statement analysis, involving analytical methods and tools such as econo-metrics, statistics, economics computational models, financial economics, mathematical finance and mathematical economics.