价格水平测度是经济学探讨的核心议题之一，其在福利分析及跨时空宏观经济比较中扮演关键角色。本文使用地区购买力平价方法测算了珠三角城市群7个城市2000-2022年的空间价格水平。依据珠三角城市群居民消费的偏好情况，设计了具有珠三角特色的规格品采集框架，利用数据爬虫方法在京东到家平台在线获取了各食品规格品的价格数据和销量数据，使用多边汇总方法CPD方法和GEKS方法进行空间价格指数的汇总计算。研究表明，珠三角城市群各城市不同种类食品价格存在较为显著的差异，且价格水平与经济发展水平呈正相关；同时外推地区食品PPP数据显示，2000年到2022年间，珠三角城市群整体的食品价格差异水平维持在较低水平，平均基尼系数为0.025，同时以2011年为分界线，总体呈现出先扩大后缩小的趋势。此发现对于深入理解区域经济结构及其演变、指导相关政策制定具有重要意义。

Measuring price levels constitutes a core subject of inquiry in economics, given its pivotal role in welfare analysis and cross-temporal, cross-regional macroeconomic comparisons. This paper employs the regional purchasing power parity (PPP) approach to assess spatial price levels across seven cities within the Pearl River Delta (PRD) urban agglomeration over the period 2000-2022.Drawing upon consumption preferences among PRD residents, we designed a commodity basket framework tailored to the region's distinct characteristics. Leveraging web scraping techniques, we gathered online price and sales data for various food items from JD Daojia, a prominent e-commerce platform. Employing multilateral aggregation methods, specifically the CPD and GEKS methodologies, we computed spatial price indices for these commodities. The extrapolated regional food PPP data reveal that, over the period from 2000 to 2022, the overall level of food price disparities within the PRD urban agglomeration was maintained at a relatively low level. With an average Gini coefficient of 0.025, the distribution of food prices across the cities in the PRD can be characterized as exhibiting a high degree of equality. Notably, this trend of price homogeneity displays a distinct inflection point at 2011, marking a transition from an initial phase of widening disparities to a subsequent phase of narrowing differences. These insights hold considerable significance for deepening our understanding of regional economic structures and their evolution, as well as for guiding the formulation of pertinent policy measures.