ソース:[1] Costco Just Made a Big Change to Its Perks, and It Affects Many of Its 79.6 Million Paying Members (https://finance.yahoo.com/news/dave-ramsey-sl ...)[2] Costco Open Early for Executive Members, Boosting Sales with New Shopping Hours (https://vertexaisearch.cloud.google.com/groun ...)[3] Costco's Membership Segmentation Strategy: A Blueprint for Loyalty, Revenue Diversification, and Stock Valuation - AInvest (https://vertexaisearch.cloud.google.com/groun ...)