Because other firms are willing to pay to advertise with them, suppliers of nonrival private goods often modify their products to take on the qualities of what type of goods in distribution? private goods public goods common resources none of the above; producers of nonrival private goods do not change their characteristics. which statements are reasons why advertising is an effective solution to the problem of some private nonrival goods? a. public goods b. advertising covers the cost of provision. c. common resourcesd. none of the above; producers of nonrival private goods do not change their characteristics.