1. I have noticed that a majority of the e-commerce websites such as apple.com,
barnes and noble.com , flipkart.com and many more have a white space border of 1 inch on either sides. Whereas Amazon.com does not have any. Is there a particular reason why is it like this ?

2. Does AJAX still have problems with SEO ? Is there a way to fix it if I wish to embed AJAX in my e-commerce website ?

Please let me know your responses.