Group 1: Portfolio Strategy Performance Tracking - The simulated portfolio returns have rebounded, with significant increases in credit positions. The industrial ultra-long and secondary ultra-long strategy combinations in the interest rate style portfolio both recorded returns around 0.15% [2][14] - In the credit style portfolio, the industrial ultra-long and secondary ultra-long strategy combinations achieved returns of 0.41% each, leading the performance [2][15] - The weekly average return of the credit style time deposit heavy combination rose to 0.14%, an increase of 9.3 basis points compared to the previous week, while the city investment heavy combination's average weekly return increased to 0.23%, up over 20 basis points from last week [2][18] Group 2: Sources of Returns - The interest income from various strategy combinations has slightly rebounded, with most strategies showing an increase in interest income. The city investment short-end sinking and secondary debt sinking strategies saw interest income increases of approximately 0.04 basis points [3][27] - The annualized interest income for most combinations remains below 2%, except for the city investment short-end sinking and barbell combinations, which are still above 1.95% [3][27] - The contribution of interest income in credit style combinations generally falls within the range of 10% to 25%, with capital gains being the primary source of returns, particularly for the city investment bullet-type and secondary debt duration combinations, where interest contributions dropped to around 13% [3][27] Group 3: Credit Strategy Excess Return Tracking - Over the past four weeks, the cumulative excess return difference between duration strategies and sinking strategies has widened. The cumulative excess returns for city investment barbell, city investment duration, and broker debt duration strategy combinations were 33.6 basis points, 7.4 basis points, and 5.8 basis points, respectively [4][31] - The excess returns for short-end strategies have decreased, with the time deposit strategy dropping to around -1.6 basis points, while the city investment sinking strategy slightly surpassed the benchmark [4][34] - The excess returns for ultra-long strategies have rebounded to levels seen in early June, with the secondary ultra-long strategy combination's excess return rising to over 17 basis points this week, contrasting with the negative readings from the previous three weeks [4][34]