Already there are 2 replies to my post that entirely miss my point, I'll try to restate it more clearly.
First off, note that any individual with a job is denying someone else that specific instance of that job. If the total piano tuning revenue in a city can only support, say, a multiple of 5 times a "decent" wage for a piano tuner then any one of the piano tuners in that town who has a job is keeping the 6th, 7th, 8th, etc. potential piano tuners out of a job. This is true all over the place. And this sort of truth becomes very painfully obvious when automation or technological advancement replaces the need for a worker in a specific job. It's easy to see a robot as replacing a worker. It's easy to see the rise of electric lighting putting candle makers out of business.
However, these are flawed and incomplete ways to look at economic and technological change. What actually happens when a robot does a job, or when a person does a job, or when technology makes an existing industry obsolete is that value is still being added to the economy. Jobs and wealth are not part of some fixed pie that everyone takes a slice out of and then robots can steal someone else's slice, that's not how it works. When someone does a job they add value to the whole and they take compensation. And the value they create is greater than the compensation they receive. Now, sometimes this isn't always the case, but in almost all cases it is, even the half-incompetent teenaged register operator at the local fast food place.
And this is true of robots as well, who can also be viewed as workers in a way. They increase the size of the pie much more than the amount of the pie (wages in the case of workers, maintenance and operating costs in the case of robots) they consume.
The incremental bulk economic impact is almost always positive for every worker with a job, even robots. This is why we shouldn't be concerned about foreigners "stealing our jobs" (or "jerbs" if you like), or about automation "taking away" jobs. The jobs that are available will change but the addition of positive value to the economy benefits everyone.
The trick is making sure the economy and individuals are agile enough to keep people working even as the job makeup of the economy changes.
However, change has always been a constant in the job market not just in the last half century but also throughout the industrial age, back to the medieval period, and even back to the stone age. We're just fooling ourselves if we think that the economy has been anything other than dynamic and ever changing, at any time in our past.
Again, the economy isn't based on a fixed pie of jobs or wealth that falls on us from the sky like manna, jobs and wealth are created by individuals. Not just entrepreneurs but ordinary workers create wealth and add value to the economy, the value of their labor.