John Authers, Bloomberg Opinion columnist, takes an unusual midyear look at his imaginary hedge fund Hindsight Capital LLC. This contrarian investment approach uses perfect foresight to identify trades that would have profited from known price movements. Authers typically reviews this thought experiment annually, but market conditions in 2026 prompted an earlier assessment.

The first half of 2026 delivered unexpectedly strong results across global markets, creating what Authers describes as a 'glorious' performance period. However, the Kospi's sustained outperformance raises questions about whether this rally can maintain momentum through year-end. South Korea's benchmark index has outperformed other major indices, but historical patterns suggest such extended runs often face correction.

Authers' framework serves as a cautionary lens, examining whether obvious warning signs are already visible to investors willing to look. The midyear check suggests market exuberance may be reaching unsustainable levels. When artificial intelligence can perfectly time trades, real-world investors should question whether current valuations reflect rational expectations or speculative excess.

The exercise reveals that even in strong markets, hindsight exposes missed opportunities and overlooked risks. Investors chasing momentum without fundamental analysis may discover that what appears obvious in retrospect was far less clear in real time.