What percentage of the U. S. gross domestic product is accounted for by quick-service
restaurants?
What other countries are major players in this
industry?
What effect does the large QSR presence have
on the U. S. economy?
What about the U. S. society?

Globally, fast food generates revenue of over $570 billion, which is bigger than the economic value of most countries. US revenue was a whopping $200 billion in 2015 versus $6 billion in 1970. By 2020, US revenue is forecasted to exceed $223 billion.

I hope it will help you

this is a good question! i'll do some research and come back when i have the answer!