Retail juggernaut: Costco keeps winning market share as Gen Y and Gen Z join the club

Costco Wholesale Corporation (NASDAQ:COST) has energized bulls with a strong December sales report. The highlight of the report may have been that the retailer’s core U.S. comparable sales improved 9.8% year-over-year and were up 23.6% on a 3-year stack. The Costco (