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Which propaganda methods are the most effective?

it depends on whether you want long-term promotion of brand image, temporary promotion, or promotion of new products. No matter which kind of promotion method, its publicity effect, pertinence and timeliness are different.

Generally, the long-term publicity effect of new product launch and brand image promotion by TV and Internet is good, and large billboards (high-speed road signs, high-altitude buildings, etc.) can also be made for the region, while the temporary promotion effect is better and time-sensitive, such as leaflets, posters, text messages and TV, and various public relations activities or interactive publicity can also be done.