US consumer spending on deal-a-day offers is forecast to reach $3.9 billion by 2015, increasing at a compound annual growth rate (CAGR) of 35.1% over the next four years, from an estimated $873 million spent in 2010, according to a report by BIA/Kelsey.

A number of key variables may impact that forecast, BIA/Kelsey notes, such as growth in the number of cities or sites, registered users, average transactions per year, average price per transaction.

Accounting for such variables, the deal-a-day market could climb as high as $6.1 billion by 2015 (a 47.4% CAGR), whereas a very conservative outlook pegs the space at $2.1 billion (19.7% CAGR).

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