A portfolio is not a collection of “good stocks.” It’s a system designed to survive different market phases. Bull markets reward concentration. Bear markets expose it. The investors who last decades usually balance three layers: Core compounders that grow steadily. Cyclical or thematic plays that benefit from specific economic phases. Cash or low-volatility positions that protect capital during drawdowns. When cycles shift, this balance matters more than stock selection. Portfolio construction is risk management in disguise.