That's why I mentioned both the numbers (and how small they are relatively), as well as previously pointing out the benefits of technological advancement and development. If we want to accelerate development in certain areas (clean energy, for example), then governments providing benefits for business to encourage them and get things started is well worthwhile. That's both in numbers and value to the world.
That's fair enough, though we will have to wait some years to find out if it was money well spent.
Let me put out some counter ideas which are opinion only.
It may be a good investment but on the other hand:
How much is actually new tech?
Musk's ventures have never made a profit and never will. They are about hype, not usefulness. For example, if you wanted a car that minimises fossil fuel use over its entire life, from manufacture to disposal, a Mitsubishi Mirage beats a Tesla hands down.
Speaking of Tesla, it has always made a loss, but its shares are valued way higher than Nissan, who also makes an electric car but also makes a profit. What's that about?
Its technology is based on materials like cobalt and copper for which there are no new easily accessible reserves. To give you an idea, Rio Tinto have started a fracking operation in Arizona (down 7,00 feet) to extract copper. Technically an achievement but it it says a lot about the future cost and availability of copper.
I'm a pessimist when it comes to doing more of the same to solve our problems. I don't see that using the same type of thinking that got us into our difficulties will get us out. It's "wishful thinking". As my dad used to say, you can wish in one hand and wee in the other, and see which fills up first.
David