What are the most common reasons why applicants get rejected post-interview?

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Bad interview, not the same person portrayed on paper, poor behaviors on interview day?
 
Bad interview? Poor application? Simply not enough spots?
Bad interview, not the same person portrayed on paper, poor behaviors on interview day?
These will definitely put the proverbial nail in the coffin for any application; however, I reckon that the majority of those rejected are simply outshone by other more accomplished applicants. There's simply more qualified individuals than spots available.
 
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