Double Coupons

You may be aware that some grocery stores will double coupons. Some stores double on a certain day each week, some will have certain weeks during the year where they double for a whole week and some stores double every day. Here locally, Rainbow Foods doubles coupons on Wednesdays. Their policy is that you can double 5 coupons up to $1.00 with a $25 grocery order. When you check out at Rainbow you need to hand your coupons to the cashier in the order you want them redeemed. That means that you want your biggest coupons on top to be sure they get doubled. The cashiers will not typically organize the coupons for you so that you get the maximum savings.
Doubled coupons are processed the same way as other coupons. However, the manufacturer only reimburses the grocery store for the face value of the coupon plus the 8-16 cents mentioned in the previous posting. Who pays for the other half of the savings you received by using this coupon? The grocery store itself eats the loss on the doubled portion of the coupon. I guess they are hoping that you will do enough impulse buying during your trip to cover this loss.