Search Engine Optimisation, or SEO, is boosted by the observance of a series of guidelines to ensure that your pages are located by the search engines automated scanners and then ranked highly in the search results that they return, because a high page one ranking is worth one hundred times that of a low page two ranking.
One of the big SEO taboos is duplication. Search engines rely on text content to find your site and rank it; and search engines love original keyword rich text content. Original content is better because information that has been cloned is perceived as less valuable, or useful, to the search engine user. Sites which copy text directly from another are even punished with a lower ranking making them a form of SEO poison.
Of course, sometimes particularly in some forms of business, it is necessary for information to be duplicated on more than one page of your commercial website, and there are ways to deal with this and prevent it from affecting your search engine optimisation strategies. If certain pages of your site carry similar information, one may rank above another in the results and this particular correlation might be detrimental to your business. This too can be combated using good SEO practices.
One method of doing so, if you are concerned about duplicated content issues, is to select the particular page which you want to rank for that text information and include its individual URL in your sitemap, but omit the URL of the page with duplicated content. This way, the page that ranks for the information there present is the one that you want to rank; and you will not be negatively affected by having that material on another page too.