International Business Machines shares plunged more than 23% on Tuesday, marking their steepest single-day decline in decades ...

Headline-driven markets are equally dangerous for option sellers. A trader selling naked options is effectively selling insurance. When uncertainty suddenly increases, insurance becomes expensive.

Languages often co-express related meanings, either reusing words or combining parts of words. It is poorly understood when each strategy is favoured. Across 1,982 languages, Brochhagen et al. find ...