Chalk it up to animal high spirits, traders told us. The stock markets have rallied significantly since the Dow Jones Industrial average hit an 11-year low on February 25.

• 交易员告诉我们，这要归因于人类本能的情绪高昂。自2月25日道琼斯工业股票平均价格指数触及11年低点以来，股市已经有了大幅上涨。