Saw this in my LinkedIn feed and found it interesting that watch spring was chosen as the example for the highest value use for iron.
I have a lump of iron that size in my garage which I use as an anvil to make or repair other things. Since I use it to increase the value of other things but never deplete it, does that make it priceless?
Gotta love recruiters on Linkedin with their cute homilies. He disregarded that those "worths" come with different costs required to transform "iron" into each end product. He should have called it steel instead of iron. An iron balance spring wouldn't perform too well.