The measureable factors that affect your SEO are:

1) Backlinks
The more relevant links there are to your website the more SEO value it will carry. Obviously a new domain will not have any backlinks to it yet. If you can buy an established site with a lot of relevant backlinks that will make your life easier as creating these links to your site can be quite time consuming.

2) Google PageRank (or PR)
Google automatically checks for the quantity and also the quality of backlinks there are to your website. This along with some other factors will determine the pagerank for each page on your website from 0 - 10 (0 for new pages & 10 for authority sites such as CNN.com).These numbers are calculated to the power of 10, so for example a PR3 is 10 times more powerful than a PR2. So the higher ranking the more powerful it will be.

3) Age of Domain
The age of a Domain is determined from the date it was registered. Age is also an important SEO factor as Google puts a lot more trust in a site which has been around for some time, rather than the new kid on the block.

4) History of Domain
If the domain name you are looking at purchasing did have content on it before which was related to the niche you are going into, then the history of that domain is good and Google will reward you.

On the reverse side if the domain had content that was not related to the niche or was of questionable quality then the bad history of that domain could hurt your SEO. So in this case you would probably be better off to register a brand new domain in your niche.

5) High Value DMOZ And Yahoo! Directory Listings
If you can get your hands on an aged domain name which already has a listing in DMOZ or in the Yahoo! Directory, then you will be saving yourself a lot of time, money and effort. It is very difficult and expensive to get these listings.

6) Indexing
If you are starting a brand new site then clearly you need to get your web pages listed on Google or the other search engines., otherwise known as getting your pages index. This is how people will find you. The more indexed pages a site has the more weight it will have with the various search engines.

So now you know some of the SEO factors to watch out for when deciding whether to buy a domain name or start from scratch.

You do not want to be penalized for things you really had nothing to do with, but why don't you take advantage of a domain for sale with SEO factors working in your favor?

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source:internet