Round and round the cost increases go, until the market settles on the new set of numbers and equalizes again. Those that you wish to help won't see anything but a short term gain, only to be lost when all the other prices increase. Remember the balloon example? It really does work that way.
I still don't see how you can jump a businesses' cost by that much without them raising their prices to compensate, regardless of how well they run their business. How much experience in the Restaurant business do you have? Last I heard their margins were very thin. That being the case, there's no flexibility or ability on their part to absorb that cost increase in labor. They have little choice but to pass it on to their customers. The customers are going to react to that. More will stay home.