When Warren Buffett was asked about his biggest investment mistake, he said his “biggest mistakes don’t show up”. That they’re ones of “omission rather than commission”.
Buffett gave the example of having the information to invest in multiple companies, but lost up to $10 billion in earnings as a result of not making those investments.
We often analyse our mistakes after the action has been committed, but it takes a unique amount of discipline to critically assess the roads we chose to avoid.