MP Materials (MP 0.16%) stock declined by 10.7% in the week to Friday morning, as sentiment toward the rare-earth sector shifted through the week. A rare week for rare-earth stocksThe week began with a bang over USA Rare Earth's agreement with the U.S. government, which will result in $277 million in Federal Funding and a $1.3 billion loan under the CHIPS Act. The market has speculated over such a deal ever since MP Materials agreed to a transformative public-private partnership with the U.S. Government in July. First, MP Materials entered into an agreement with the Department of Defense (DoD) that established a 10-year pricing floor of $110 per kg for MP Materials NdPr (Neodymium-Praseodymium) products. What it means to MP MaterialsWhile MP Materials already has an agreement and should not be affected by any potential change in the administration's approach to price floors.