Recently, a lot of Google Publishers have experienced a low or zero cpc with their Adsense earnings. This began when the global health crisis started to affect almost all countries in the world especially the greatly hit, USA.
If you have been tracking your earnings on a daily basis, you will notice a zero or even low cost per click or cpc with your adsense-driven web pages.
Most especially those having travel or tourism related websites suffered much of this cpc issues. As a number of countries imposed the international travel bans that lead to flight suspensions of airline companies, we only see a few advertisers.
What could be the reason for this?