商务部学术委员会委员白明向21世纪经济报道记者表示，很多货物进入海南享受零关税待遇，原本只有 21%的货物是零关税，现在该比例已经超过70%，对于资源配置来说是低成本高效率的。岛内自由包括 不同主体之间的零关税待遇，再加上出台了企业和个人所得税税率"双15%"优惠政策。营商环境进一步 优化，也增加了海南的吸引力。 在上述国新办发布会上，国家发展改革委副主任王昌林指出，封关不是封岛，而是进一步扩大开放，封 关后海南与国际的联系将更加便捷，这对于加快吸引全球优质要素集聚，促进海南自贸港高质量发展， 为全国改革开放探路开路，具有重要意义。全岛封关运作是海南自贸港开放发展新阶段的开始，也是一 项长期持续推进的任务。下一步，将以封关为契机，积极推动各项政策落地见效，并根据海南发展需 要，不断扩大开放度，持续完善自贸港政策制度体系，加快构建开放型经济新体制，努力打造引领我国 新时代对外开放的重要门户。 21世纪经济报道见习记者张旭 北京报道 经过五年的准备后，海南自贸港全岛封关将于2025年12月18日 正式启动。 什么是封关？对企业和人员往来有何影响？封关之后有哪些新的税收政策？在国新办7月23日举行的发 布会上，国家 ...

Core Insights - The article highlights the successful implementation and impact of the processing value-added tax exemption policy in Hainan Free Trade Port, which has significantly benefited local enterprises and stimulated economic growth [1][2][3]. Group 1: Policy Implementation - The processing value-added tax exemption policy was launched on July 23, 2021, with the first successful transaction occurring just 15 days after its announcement, showcasing the rapid execution of the policy [2]. - A comprehensive service system was established to support enterprises, including policy promotion, research, and business guidance, leading to an expansion of the policy's reach across Hainan [2][3]. Group 2: Economic Impact - Since the implementation of the policy, the cumulative internal sales value has reached 9.056 billion yuan, resulting in a tax exemption of 711 million yuan, illustrating the tangible benefits of the policy [3]. - The policy has enabled companies like Hainan Oscar International Grain and Oil Co., Ltd. to grow their annual output value from zero to 4.8 billion yuan within three years, indicating a significant economic uplift [4]. Group 3: Industry Diversification - The policy has facilitated the diversification of industries, expanding from initial focus on grain and oil processing to include sectors such as seafood, medical devices, petrochemical materials, textile processing, and coffee bean processing [5]. - The establishment of a health food industry cluster in Yangpu Economic Development Zone, focusing on premium meat, functional foods, plant protein foods, and healthy oils, demonstrates the policy's role in fostering industrial growth [4][5].