レモネード（Lemonade）の原則とは、予期せぬ出来事を機会として活用するという原則で、計画外の出来事や失敗を積極的に活かし、ビジネスチャンスに変えようとする考え方です。
Lemonade principle
The Lemonade principle is the principle of using unexpected events as opportunities, and is a way of thinking that actively takes advantage of unplanned events and failures and turns them into business opportunities.