Economists are increasingly concerned over the impact of the “rise of robots” and other technological innovations on employment levels.

Now a former McDonald’s CEO has warned that robots will take over the fast food industry because they are cheaper and more efficient than humans.

Ed Rensi, claims that if low skilled employee insist on having an increase income in the US, their employers will be forced to replace them with more productive and cost-effective robotic innovations.

“It’s cheaper to buy a $35,000 [£24,000] robotic arm than it is to hire an employee who’s inefficient making $15 [£10.20]an hour bagging French fries,” Rensi said during an interview on Fox.

"It's nonsense and it’s very destructive and it’s inflationary and it’s going to cause a job loss across this country like you’re not going to believe," he added.

Rensi believes lawmakers should do away with a federal minimum wage and instead leave it to the states.

“I think we ought to have a multi-faceted wage program in this country.If you’re a high school kid, you ought to have a student wage. If you’re an entry level worker you ought to have a separate wage,” Rensi said.

His comment came as US democratic lawmakers and trade unions across the country are fighting to raise the minimum wage of a person to $15 hour.

Hundreds of McDonald's and Taco Bell employees walked out in the largest strike in the history of the fast food industry in 2012 to demand a $15/hour wage. By 2015, the movement had spread to 270 cities across the US.

Meet the robots - the strange creations of Boston Dynamics Show all 6 1 /6 Meet the robots - the strange creations of Boston Dynamics Meet the robots - the strange creations of Boston Dynamics The LS3 is a four-legged, intelligent robot with an array of cameras and sensors that allow it, for example, to follow a leader of all kinds of terrain Boston Dynamics via YouTube Meet the robots - the strange creations of Boston Dynamics The eeriest of all the Boston Dynamics robots, the PetMan could - among other things - test chemical suits Boston Dynamics via YouTube Meet the robots - the strange creations of Boston Dynamics PetMan's big brother, Atlas may be used as a first response to disaster situations Reuters Meet the robots - the strange creations of Boston Dynamics RHex has been developed to cross the trickiest terrain and can be controlled from 700 metres away Boston Dynamics via YouTube Meet the robots - the strange creations of Boston Dynamics Built for speed, Cheetah can run at 28.3mph - and can prove it on the treadmill Boston Dynamics via YouTube Meet the robots - the strange creations of Boston Dynamics The remote-control car with a difference - it can jump 30ft in the air (wouldn't you want one for Christmas?) Boston Dynamics via YouTube

In California the minimum wage is set to rise from $10 (£7.02) an hour to $15 (£10.60) the highest state-wide minimum wage anywhere in the US, it was announced in March.