黑色系商品价格突然暴跌，发生了什么？

Group 1 - The black commodity prices have significantly declined this week due to a retreat in market bullish sentiment, with coking coal futures dropping by 7.34% on the first trading day of August and a cumulative decline of nearly 20% for the week [1] - In the coal-coke-steel industry chain, coking coal prices have shown a strong upward trend, with the main factory price for Shanxi coking coal rising by 110 yuan/ton to a range of 1410 to 1480 yuan/ton, reflecting an increase of 8.24% compared to the previous week [3] - The overall steel market has experienced a rebound in July, with the national steel price averaging 3677 yuan/ton, an increase of 247 yuan/ton or 7.2% month-on-month [4] Group 2 - Analysts expect that infrastructure investment growth will remain resilient in August, driven by increased fiscal support and the commencement of major projects, which may lead to improved supply-demand dynamics in the steel market [5] - Despite the recent price increases, there are concerns about demand sustainability, as social steel inventories have risen by 7.8% month-on-month to 859.9 million tons by the end of July [4] - The market is anticipated to experience a correction in August due to rapid price increases, with potential for a rebound following the implementation of relevant policy measures [5]