The gold price rose by 13% in 2017, its best performance in seven years. A stuttering dollar and a boost in demand from lunar new-year celebrations has helped the rally continue. Gold is up by 7% since mid-December and recently hit a near 18-month high. Platinum, used in emissions-reduction technology, has also seen its price rebound from a mid-December slump, benefiting from its strong correlation with gold and China’s crackdown on pollution. Base-metal prices have risen even faster. The Economist’s metal-price index, which excludes precious metals, rose by 23% in 2017. This was largely driven by factory closures in China and the hope that electric vehicles, full of copper, are coming of age.