Finance · 07/18/2025

Arbitrage Pricing Theory (APT) analyzes expected asset returns through multiple factors, highlighting that many economic risks, such as inflation and fluctuations in national income, cannot be diversified away. Compared to the Capital Asset Pricing Model (CAPM), APT offers greater flexibility, as it does not rely on a market portfolio and has fewer assumptions, providing broader applicability for theoretical use.

Telecom · 07/18/2025

This article provides an in-depth analysis of the real-name and non-real-name systems for US SIM cards. Real-name cards typically involve postpaid plans that require users to provide personal information, making them suitable for those who need billing. In contrast, non-real-name cards are prepaid, allowing for easy purchase without the need for identity verification, appealing to users who prioritize privacy. Choosing the right SIM card depends on individual needs.

Culture · 03/24/2025

Starting March 31, the new Social Security regulations in the U.S. require beneficiaries to conduct welfare transactions online or in person, while phone services have been discontinued. Experts warn that this policy may exacerbate the challenges faced by vulnerable groups in remote areas, particularly in high-poverty regions lacking internet access and transportation assistance. The government needs to reassess the policy to ensure fairness.