Even that definition raises as many questions as it answers. The gaps in your phrasing mean that this phenomenon could be either potentially benign or malignant.
For example, unpacking "marketing:" Are we referring to a system that attempts (and succeeds) at fostering a culture in which people define their self worth by their material possessions? That would be definitely problematic. On the other hand, if we're simply talking about a system in which businesses go out and hawk what they have to offer, that hardly seems abnormal or suspicious. You'd hardly expect Apple not to want to tell the world about the iPhone 5, nor Jeni's to introduce a new flavor but not tell anyone about it.
To the extent that consumerism is defined--by any number of definitions--in such a way that it pressures people and institutions to routinely spend beyond their means for consumption-oriented purposes, then that's certainly problematic. On the flip side, as others noted earlier in the thread, there are other sides to consumerism as well.
Also, just in terms of the coherence of your series: I'll be interested to see how you actually tie in Bernie Madoff into your definition of consumerism. I think you've made a connection in your mind that you want to see, but isn't intrinsic to your definition. I see no particular connection between that and consumerism. His fraud was not consumer-oriented, it was investor-oriented, and was a service, not a product (notwithstanding how much modern consultant-speak seems to want to recharacterize all services as goods, as if you could pick them up and hold them). If you start conflating investments as consumption items, you've obliterated the fundamental definition of both terms. Likewise, if you see evidence of consumerism in every act motivated by material greed, then I think you're secretly working with a far, far broader definition of consumerism than the one you just stated.