Checking sizes on a product page [duplicate]

1. How do you check if content is duplicate or not?
2. What percentage of duplicate content is acceptable?
3. Why is duplicate content a big problem?

How do you check if content is duplicate or not?

Using Google to check for Duplicate Content

One quick way to check if a page may be considered duplicate is by copying around ten words from the start of a sentence and then pasting it with quotes into Google. This is actually Google's recommended way to check.

What percentage of duplicate content is acceptable?

How Much Duplicate Content is Acceptable? According to Matt Cutts, 25% to 30% of the web consists of duplicate content. According to him, Google doesn't consider duplicate content as spam, and it doesn't lead your site to be penalized unless it is intended to manipulate the search results.

Why is duplicate content a big problem?

Product pages with duplicate content may or may not rank. And if they do rank, they may not hold their ranking if Google becomes confused and isn't sure which piece of content to rank. If you have thousands of pages of duplicate content, it may take some time to get everything fixed.