1 sat equal to 1 sat. 

When milk for 3 sat 
When bread for 3 sats
When gas for 5 sats 

When not in this lifetime sorry  

 Satoshi standard in my lifetime:) 

 I bet we'll see cent to sat parity sooner than most realise.  

 I hope so. Im on that team but being in it takes longer because im waiting for it everyday hahahaha