Estimates are that labor costs are more like 33% of the costs of a fast food restaurant like McDonalds:

https://s3.amazonaws.com/s3.documentcloud.org/documents/2915...

Increasing pay by close to 50%,one would expect that prices would have to increase by closer to 15%, not 4%. Though, given how price sensitive those customers are, it isn't clear how much you can raise the price.

In terms of margin, it looks like McDonalds is doing much better than other chains:

>...In 2012, for example, when McDonald's had a net profit margin of just under 20 percent; Burger King's net margin was less than a third of that and another big chain; Wendy's, had a scary thin 0.3 percent.

https://smallbusiness.chron.com/average-profit-margin-restau...

But even at McDonalds, I think it is safe to assume that in the longer term, fast food restaurants would look into replacing rising labor costs with machines - that might be replacing cashiers with kiosks or even machines that prepare and cook the food, etc. This would be expected to happen anyway, over time, but mandating huge increases in labor costs will mean it happens quicker and be more disruptive. (One might say "good riddance" as these aren't great jobs, but they are entry level jobs which are disappearing in all industries.)

This is my primary reason for supporting it.

Both rent and house prices shot up. Those who owned houses profited massively from the unearned wealth increase. Those renting suffered.

We're now in a situation where everyone needs 2 full time high wage earners to pay for the same housing and lifestyle that used to be done by 1 full time high wage and perhaps 1 part time low wage

Not to mention, rent control is a good idea in addition, or finding ways to make homeownership more in-reach for more people.

But a much larger change to profits. And it's the profits that matter to the business decision makers.