Explain more detail with example and with citation in Harvard style for Strategic Decision$-$making: Effective strategic decision$-$making is crucial for entrepreneurial ventures. However, studies have shown that many startups fail due to poor strategic decisions, such as entering a saturated market or failing to adapt to changing market conditions. For example, a study by Crumley and Brown $(2010)$ found that $85\%$ of startups fail due to poor strategic decisions.