The sharp Shanghai stock-market decline on August 24, 2015, was nicknamed Black Monday.
The Shanghai Composite Index fell 8.49% that day, its largest one-day percentage decline since February 2007. Selling followed a broader slide that had begun after the index reached a five-year high in June 2015. Concerns about slowing Chinese growth, currency policy, and the effectiveness of official market support intensified the fall.
The turbulence was not limited to mainland China. Equity markets in Europe and the United States also dropped sharply, and commodity prices weakened. The global reaction showed how important China had become to investor expectations and international trade.
This event is commonly confused with Black Monday in 1987, the name used for the historic worldwide market crash. The 2015 label refers specifically to the August 24 session and the Chinese-led market turmoil surrounding it.