Elon Musk likes to suppose large, from big rockets to blockbuster pay packets and large, if misguided, investments in social media. In Mexico’s case it was an funding, introduced in March 2023, in “the largest ev plant on the earth”. Tesla’s boss mentioned that he would spend $5bn to construct a “gigafactory” in Nuevo León, a state bordering the US, that on completion in 2026 would churn out extra electrical automobiles (evs) than any of his present services in America, China and Germany. Nearly two years later, nonetheless, Tesla has but to interrupt floor. Why has the mercurial Mr Musk’s curiosity cooled?