The two major factors contributing to the decline in advertising effectiveness from the options provided are:
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Consumers' lack of trust - Many consumers are increasingly skeptical of advertising messages, which can lead to reduced effectiveness as they may ignore or dismiss ads.
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The effects of digital media - The rise of digital media has changed how consumers interact with advertisements, leading to factors like ad fatigue, ad-blocking, and a preference for personalized or relevant content, which can diminish the overall effectiveness of traditional advertising methods.
While minimal product innovations can contribute to advertising challenges and increased opportunities for personal selling can affect advertising strategies, the first two options are more directly tied to the effectiveness of advertising itself.