The concept of not using the products and services created out of the particular geographical region, which can be the town, city or country. Usually, the country base phenomenon is used for highlighting the issue. The argument here is that external companies or people should not be chosen because of the explicit and implicit cost involved.
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Further Reading/ References
https://www.webopedia.com/TERM/N/not_invented_here_syndrome.htmlhttps://www.techopedia.com/definition/3848/not-invented-here-syndrome-nihshttps://en.wikipedia.org/wiki/Not_invented_here