Further Reading: Savings
Saving ... "Saving" differs from "savings." The former refers to an increase in one's assets, an increase in net worth, whereas the latter refers to one part of one's assets, usually deposits in savings accounts, or to all of one's assets... Saving refers to an activity occurring over time, a flow variable, whereas savings refers to something that exists at any one time, a stock variable...
Coupon ... They may also be used to increase the sales of a certain newspaper for example, as many people who have discovered the savings they can do with these coupons, tend to buy more than just one copy of that newspaper or magazine...