recently,In the background of Adsense, I found that the average cpc of a first-level domain is greater than the average cpc of a second-level domain. For example, one click for .com is about 0.3$, and one click for www.com is about 0.1$. My guess is that the .com's index page and rights are more important than www.com. Therefore, advertisers are bidding fiercely, so the unit price is high. Don't know what the reason is? Thank you