We compare the suitability of short-memory (ARMA models), long-memory (ARFIMA models), and a GARCH model to describe the volatility of rare earth elements (REEs). We find strong support for the existence of long-memory effects. A simple long-memory ARFIMA(0,𝑑,0) base model shows generally...

Molycorp, the western hemisphere's only producer of rare earth minerals, was in the middle of a $1 billion capital expenditure project in its effort to become a vertically integrated supplier of rare earth minerals, oxides, and metals. Yet it had just reported lower than expected revenues and...