I try to answer this question by studying 206,990 transactions of 1,395 deals which are sold on a Vietnam group-buying site in 12 months. There are about 290 deals, each of which has sold over 500 coupons.
A transaction, in this context, records the total number of coupons which a consumer bought in a deal. For example, if Mr. A bought coupons of a deal at different dates (e.g., 5 coupons on this Monday and 4 coupons more on this Friday), then one transaction would be recorded that Mr. A had bought 9 coupons of that deal.
1/ Only one website is observed.
– 61% of the transactions in which a consumer bought 1 coupon only.
– 01% of the transactions in which a consumer bought over 10 coupons.