When targeting keywords phrases it is advisable to take on the plural phrases as it contains both things plural and singular as for example businesses contain the word business but it is different in Yahoo and MSN. Well the ranking position is also differs sometimes but it would be better to optimize the content with plural.

I did some testing and found that Google treats them in exactly the same way and if you search for "BUSINESSES" it will give you results with "BUSINESS" highlighted in websites that do not contain the plural version.

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i think plural.....

i think words in plural form are specific ;P

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