irrational

Through reading the book "the upside of irrational", i understand a new idea, which is "irrational consumption".

We always use rational motion to buy some thing, but why we can't use "irrational" motion to consume. In fact, we think our consumer behavior is rational, but maybe it is not correct.
So, in the some times, irrational consumption is not a bad thing, we still can own some products, which we love them.