◼ IN BRIEF
● Worldwide coronavirus cases have passed 450 million, more than 6m people have died, and almost 11 billion vaccine doses have been given. Puerto Rico is dropping most of its Covid-19 rules, which are among the strictest in the U.S. The territory has one of the highest vaccination rates in the country. ● The price of nickel briefly topped $100,000 a ton on March 7. The spike may have resulted from a “short squeeze” as investors betting against the metal sought to close their positions. Xiang Guangda, whose Tsingshan Holding had amassed a short position of 100,000 tons, may be facing steep losses. Nickel traded at $25,000 a ton as recently as February. ● Guy Reffitt, the first person to go on trial for his participation in the Jan. 6 insurrection, was convicted…