[Python/Fin]打造股票質押計算器(3)：歷史數據滾動回測模擬

This article uses real historical data of Taiwan's 0050 ETF to backtest a leveraged stock pledge (margin lending) strategy, comparing different maintenance ratio settings (300% vs 500% vs no leverage). The 2008 crash showed that a 500% maintenance ratio safely survived while 300% barely held; from 2019 onward, higher leverage amplified gains significantly, with the 300% group reaching 184% of the no-leverage portfolio by 2024.