Promotion with the Gap creates a $4 million day for Groupon

Do you subscribe to Groupon? It’s a Web-based coupon service that’s creating huge revenue for itself and the companies it partners with. On Thursday, it offered a coupon that cost $25 that could be redeemed for $50 worth of merchandise at the Gap. By dinner time, Groupon had already sold more than 300,000 coupons. That equates to a banner day for the Gap — and $4 million in revenue for Groupon. — Claire Celsi