One example of this is the belief that wearing comfortable shoes is necessary, when in fact, shoes are a very recent development in our history. Lieberman suggests that a second factor is that humans believe that if something is comfortable it must be good for us. For us, it is normal to live the way we do, and therefore, we overlook potentially dangerous behaviors. Lieberman suggests that this behavior occurs because we fail to see the novelty of our situation. Examples of this include smoking, tanning booths, and pollution. We willingly engage in potentially harmful behaviors because they have benefits short term, but may have consequences in the long term. In this chapter, Lieberman discusses the evolutionary reasons behind our reasoning in cost benefit analyses.
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