Starting with a small amount of capital and achieving more than five times compound growth can verify a trader's long-term stable profitability for four reasons:

First, small capital can control risk. During the initial learning and trial-and-error phase of trading, losses do not severely damage the capital, which is beneficial for accumulating experience and improving skills;

Second, it can strengthen psychological resilience. When using small capital, emotions are easier to manage, and the process of compound growth tests patience and emotional management, helping to maintain calmness in long-term trading;

Third, it can validate strategy effectiveness. The market is variable, and long-term compound growth based on small capital indicates that the strategy is stable and adaptable;

Fourth, it reflects stable compound growth. Achieving more than five times means the strategy is viable, consistently executed, and continuously profitable. A single large profit cannot validate long-term viability. In summary, this process can verify a trader's stable profitability in the actual market.