Individuals Sold a Record Amount on the Best Day in Market History
Disclosure: this post was written with the assistance of an AI system (Claude), which wrote the analysis code, ran the experiments and drafted the text. The topic, the constraints, the data choices and the final review are the author’s. On 31 July 2026 the KOSPI rose 17.91%, the largest one-day gain in its history, and Korean individuals net sold a record 8.2543 trillion won into it. So I priced the rule: selling every 15% drawdown cost 2....