答案:During the 1800s, manufacturers were principally concerned with production. The burden of marketing fell on wholesalers, who used advertising primarily as an information vehicle. Ads appeared in publications called price currents that informed retailers about the sources of supply and shipping schedules for commodities. Montgomery Ward and Sears Roebuck produced the earliest catalogs, bringing a wide variety of products to new, rural markets. Only a few innovative manufacturers (mostly of patent medicines, soaps, tobacco products, and canned foods.foresaw the usefulness of mass media advertising to stimulate consumer demand.