Core Viewpoint - The article emphasizes the importance of border cities in China's modernization efforts, highlighting the need for economic development and population retention in these areas, particularly through border trade and cooperation with neighboring countries [1][16]. Group 1: Economic Development Initiatives - The Chinese government has introduced significant policies aimed at promoting border trade and improving the livelihoods of border residents, such as "治国必治边" and "兴边富民" [1]. - Black River City, a century-old border city, has seen a population decline from 1.674 million in 2010 to 1.286 million in 2020, indicating challenges in retaining residents [1]. - The border trade model in Black River includes a unique "on-site processing + intra-zone trading" dual-track approach, which enhances the value chain and supports local economic growth [6][18]. Group 2: Border Trade and Employment - The border trade allows residents to earn additional income, with individuals like Chen Jiang making around 6,000 yuan monthly from transporting goods across the border, supplemented by a 3,500 yuan subsidy [3][4]. - The establishment of professional cooperatives, such as the Zhong'an Cooperative, has enabled border residents to collaborate and strengthen their market presence, addressing the challenges of small-scale operations [6][18]. - The introduction of a digital service platform for border trade aims to streamline processes and enhance participation among residents, particularly in trade declaration and logistics [13][18]. Group 3: Infrastructure Development - The construction of the China-Russia cross-border cableway and the Black River Bridge has significantly improved cross-border logistics, facilitating year-round trade and enhancing the efficiency of border crossings [10][11]. - The Black River trade zone has seen a trade volume of 146 million yuan since the implementation of the border trade processing policy in 2020, with participation from nearly 20,000 residents [8][12]. - The establishment of the Black River Border Trade Industrial Park is crucial for attracting processing enterprises and fostering industrial cluster development, which is essential for sustainable economic growth [12][18].