We know that content of each page should be unique and useful for users.
Google will penalize thin websites with low quality content and duplicate content.
What I want to know is what is the exact meaning of "Duplicate Content" & "Low Quality Content".
Assume that we have a website with 10,000 pages and some parts of each page is repetitive in the layout in all of the pages.
Look at this example :
Does Google count repetitive content of the layout of pages as "Duplicate Content" ?
Is this page a "Low Quality" page because the unique part is lower than 300 words ?
When somebody searches a keyword including some of words that are in the layout words, does Google show them to the user ?
Is "Ratio" of unique/repetitive content important ? if yes, how much it should be ?