The article explains how the vegetable market in Beijing has been affected by the local new crown epidemic in Hebei, leading to increased prices for vegetables. The rise in transportation costs and poor road conditions have contributed to the price hike, with green onions reaching 8 yuan per catty. However, prices have since dropped to around 5.5 yuan per catty as transportation has improved and epidemic controls have been relaxed. Despite the higher prices, the market volume has reached about 90% of the same period last year, ensuring consumer demand. Supermarkets like Carrefour have increased their stocks to maintain supply and stable prices. The article also mentions the allocation of vegetables from other production areas like Shandong, Sichuan, and Yunnan, ensuring the supply in Beijing remains stable.