Part of the aim of your studies is to make a contribution to the existing body of academic knowledge. Without a literature review there would be a risk that what you are producing is not actually newly researched knowledge; instead it may only be a replication of what is already known. The only way to ensure that your research is new is to find out what others have already done. However, this is not to say that you should never attempt to research some things that have been done before if you feel that you can provide valuable new insights.
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