You Know,
Your figures indicate that steel usage per capita is down 20%. You provide some possible reasons. I will only address one, since I would have to do some research on much of what you have written. Regarding the use of steel in cars, the use of steel is down as auto makers have used lighter materials, such as plastic to increase energy efficiency. This has not made cars less safe. On another thread, I pointed out that there has been a decline in deaths and injuries on the highways over the last 30 years. This has been due in part to a combination of factors in automobiles such as, mandatory seat belts, air bags, anti-lock brakes, and collapsable front end bumpers. None of these features existed in 1960.
While the weight reduction in cars has been substantial leading to higher fuel efficiency, I can not at this time give information as to the amount of the 20% steel reduction is due to this factor. Of course, there are other products where plastics and size reduction has reduced the use of steel. For example, a modern furnace is less that half the size of a furnace made 40 years ago, so for this product less than half the amount of steel is needed. An example regarding plastics. In 1960, typewriters were made entirely of metal. Much of the keyboard, computure moniter, printer, scanner, and tower are made of plastic.
Another product that has reduced the use of steel are composite materials that contain no metal. These have been used in the past, primarily in airplane and aerospace applications. As the costs are reduced more consumer applications will result. These materials have the advantage of being at least as strong as steel and they are not subject to corrosian. Research is going on right now, to use composites to make truck beds.
Regarding the gold issue, I would have to further read before I could comment.
When you used the term 'speculator", I thought you referring to people who were buying and selling gold for a profit in a fluctuating market.
I still think we are at the same impasse. I see no evidence at productivity is down. In fact, productivity is up dramaticly. I agree with you that our infrastructure needs work, but I don't see it collapsing any time soon.