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The key takeaway here is storytelling. Corporations that attach their product to a larger social conversation are able to create a story that resonates with their audience in a new, and powerful, way.
The example of the Campbell's soup cans above illustrates this well. Generally speaking, mothers buy soup. Generally speaking, women are primarily impacted by breast cancer. Buy tying the two together, Campbell's is able to reinforce the narrative that it cares about women, and that by purchasing it's soup, consumers can contribute to a fight they're likely to care deeply about themselves.
This entire narrative can be conveyed through a cause marketing effort in a much more effective way than through traditional marketing efforts. The storytelling matters. And companies aren't going to give up on that any time soon - no matter how bad the economy gets.