If an industry causes job losses elsewhere it also reduces demand for its own product. These macro-economic phenomena offset each other. Innovation is also offset by innovation elsewhere. You are making the same argument that the Luddites made, and it didn't come true there either. I'm no champion of the free-market, but I at least appreciate the effects that it has. There is absolutely no incentive in business to allow the economy to shrink - look what happened when it did.
Beyond the technological singularity (which we aren't remotely close to achieving), there is absolutely no basis for saying that unemployment is going to rise consistently in the long-term due to innovation. As I said before - it does result in short-term job losses, and the turbulence of the 19th century is a testament to that. However, you might have noticed that after that there was also a period of 1-2% unemployment for 2 decades.
Simply saying "my local bank has lost some jobs recently due to automation" is no reason to lose our heads. Yes, it is possible that eventually everything may be automated - until innovation is automated and no-one wants any human interaction there is no need to worry.
I believe you completely underestimate the markets and big business. We already have people on this very forum who seem to dislike human interaction. Young people today spend most of their time engrossed in mobile devices using their tech for as much as they can. What will happen is that the only people who will have a job are those who are well educated but being a student I'm sure you have no problem with that. But to have a successful economy those at the bottom need to have a decent jobs and a decent wage. If you automate all those jobs that don't require a degree or a very high standard of education the economy will shrink drastically.
Yes, yes it has. Beyond the very simple process of exchanging goods for money, trade is nearly unrecognisable in its current form from even 200 years ago.
No the methods we use to trade have changed massively but the basic principle hasn't. If people don't have jobs to earn money to pay for goods and services then the principals of trade would have to be thrown out as people won't have anything to trade for the goods and services they need.
