Pontificate your "externalities" to your heart's content, when...

Pontificate your "externalities" to your heart's content, when you're done it may be worthwhile examining the facts.

2009 DyO had an economic value of $90kg, during the 2011 supply shock it spiked ~$2500kg, subsequently it was a spruiker's delight with forecasts of massive shortages 2015, see Adamas data quoted by NTU, amusingly there were going to be humongous shortages of Yttrium at the same point.

That was the point a group of failed U explorers realised they had some low grade patches of RE lying around the place, and all they needed were a few glossy PDF's to start mining.

Unfortunately for the story line, OEM's decided they weren't going to be held for ransom and either "heavies" had to go, or they would, and we've only just got over the resultant demand destruction, and DyO is back to $180kg.

Effectively the handful of punters here are clinging to a brief mkt aberration that came and went six years ago, with every mag maker of consequence knowing they delete/reduce Dy/Tb to remain competitive.

The price fantasy was artificially maintained into 2015 by spruikers such as Fanya Exchange, some even offering Dy bullion as investment grade believe it or not!

https://www.wealthdaily.com/articles/how-to-buy-rare-earth-bullion/3133

In the three years since 2015 NdFeB exports from China have grown nearly 50%, 21ktpa to 31kt 2017, at the same time since July 2015 DyO prices have collapsed under $200kg, and stayed there, for nearly three years now.

There is no economic rationalisation for "heavies" investment, other than prayer.

But then you are worshiping False Idols.