Technically, he wouldn’t have to double sales price to handle a 2/3 labor cost, no. That’s not correct.
To maintain the same margins, he would have to add the 2/3 increase in labor x the percentage of labor cost, as you were attempting to illustrate. This assumes all increased labor costs remain consistent.
Nonetheless, I expect screens (like now at Jack in the Box) will replace order-takers, and they’ll use speech recognition.
At the grocery store, you won’t even check yourself out anymore, nor will there be checkers in the future:
https://www.youtube.com/watch?v=eob532iEpqk
Beef is up over 50% since mid 2000’s. That wasn’t an economic crisis but minimum wage increases are treated as catastrophes. That makes no sense to me. I don’t understand the emotional and hyperbolic responses to the minimum wage discussion.