Numerator = USD conversion rate 
Denominator = 1,000,000 

1 sat = 1 cent 

IMO, once we reach sat/cent parity, that will be the point where majority of population will understand conversion rate (ie, dollar tree/menu item would be 100 sats etc,). Also believe that history books will reflect that as an event that shapes the future global monetary system and propels us towards a bitcoin standard.  

Just a view point and different perspective I’ve had for several years and one I’m committed to continue.