Philip Fisher
Principles
Repeatable rules that beginners can study and adapt.
Applicable principles
Research the ecosystem around the business.
Assess innovation, sales ability, and management quality.
Hold for a long time if the growth thesis remains intact.
Do not only look for cheap ratios; understand growth quality.
Turn these principles into a pre-investment checklist. If an idea cannot pass the checklist, staying out is often better than forcing action.