Amazon has experienced several disappointments with the ratings of items for sale in the past, as several sellers bought good ratings from consumers in exchange for certain perks, such as gift certificates. Now, the site is once again singled out for having reached a rather astonishing agreement with the Chinese government. Indeed, a collection containing various texts and speeches by Chinese President Xi Jinping has been put up for sale, and for two years the Chinese state has forced Amazon to remove all reviews below 5 stars (which is equivalent to the maximum rating ). The Times reports that the…