每日钉一下（什么是通货膨胀？如何衡量呢？）

Group 1 - The article introduces the concept of bond index funds and highlights that most investors are familiar with stock index funds but not with bond index funds [2] - A free course is offered to educate investors on how to invest in bond index funds, along with supplementary materials like course notes and mind maps for efficient learning [2] Group 2 - Inflation is defined as the general increase in prices of goods and services over time [6] - The Consumer Price Index (CPI) is used to measure inflation, which tracks the prices of a basket of 268 essential consumer goods and services [7] - The article notes that CPI is an average and may not reflect individual household experiences, as consumption patterns vary significantly between different families and cities [7]