duplicate content

[SerenMckay]

Does duplicate content within a single page affect SEO?

[RH-Calvin]

Duplicate content can be avoided by checking your website content in various online plagiarism checker tool like Copyscape. Duplicate content in harmful for your website and should be avoided to keep your website safe in search engines.

[seojesica]

In simple words i would like to say yes....

[jankosoft]

Copy material generally relates to purposeful prevents of material within or across websites that either completely coordinate other material or are significantly similar.

[manchun]

duplicate content is harm for any website. you should publish original content at website.

[davidweb09]

Yes, Singe Page Duplicate content will hurt whole site ranking.

[Rado_Ch]

Any content that is not informative, does not help the reader get the needed answers is not important to google. Imagine you have duplicate content in a book, will you read it a second time if you already know it and have already read it ?

Anyways your question can be understood in two ways, either of them are not a good SEO practice and will lead you to no where.

1. you have a very large page and some paragraphs are duplicate, meaning paragraph 1 is duplicate to paragraph 4 - to sum up - not good for google

2. you have copied some paragraphs from some other sites. There are niches in which you cannot invent new words or terms, lets say the medical niche, but still direct copy paste of the text is more than a negative signal to google that your site offers nothing but already known information and has no reason to be moved forward in the rankings.

hope this sheds some light