A new breed of ` ` ' premium '' Web sites increase flexibility by making mass deals . The market leader , Groupon , traces its origins back to 2008 . The site offers one deal per day in the cities it covers . The more users a site gains , the more leverage it has to score discounts .
A new breed of `` group buying '' Web sites offers discounts by gathering mass purchases . The market leader , Groupon , traces its origins back to 2008 . The site offers one deal per day in the cities it covers . The more users a site gains , the more leverage it has to score discounts .