Collect relevant research papers in your research area. Go through and you will get an idea. Then fit in your statement of problem and find solutions. Regarding sample size there are online sample size calculators are available, you can use it
I understand that you should review the foundations or principles of agricultural economics. You should also choose a particular approach, for example it could be: "rural development" "reality and perspectives", considering a period of time or a specific geographical location. If you think about small businesses, you could focus on "local development".
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first, you must have an idea about what you want to research. When colleagues Federico Del Giorgio Solfa Ljubomir Jacić Abdullahil Mamun written what to do.
Agricultural Economics as such is a wide topic for writing an essay. Based on the problem that you would like to address, first specify the topic within agricultural Economics field.
Then, answer the question: what is the problem that you would like to address? Why is it a problem? what research questions do you like to raise related to the issue/s? and thus, what specific objectives are going to achieve through your essay?
Then, identify the methodology that could enable you go through your essay; the methodology must be scientifically acceptable.
For all these, you need to review articles and other literature related to the topic of your concern (start with recent articles); use your literature review as guiding principle, but also to avoid redundant work.
Hi Dear Of course, the title is not just a difficult task, but it is important in order to solve the problem and move to the edge of the knowledge frontier.