Why isn't perpetual high unemployment inevitable?

[richardhutnik]

scottie said:

richardhutnik said:

What I mean is that the nature of sustainable technology is such that you can retrain workers in current industries to do the same work.  The amount of labor required doesn't increase.

But it doesn't decrease either, hence why unemployment isn't more prevalent

Same amount of labor here is total number of people employed, not percentage of the population.  If the amount of labor required by an industry remains flat, and population increases, the amount of unemployed increases.  What I am looking at here is trends in what is going on, and seeing if there is alternatives to counter this.  What I have seen is speculation on what might be needed more of, not what actually is.  

While it might end up being yet another thing that reduces total amount of labor, but it looks like the human race is now stuck on what can be next, and equivalent to the Internet, that fundamentalloy shifts the way things would be and the demand for labor, like the Internet did, which did create a lot of new jobs.  Part of my asking is what is quanitifiably different than what we have now coming down?  Tourism doesn't seem to be an answer.