This is a good paper but I believe it is misinterpreting the results. There is strong evidence that people have a limited capacity for making tough decisions. This "willpower" or "bandwidth" gets used up as decisions are made. I think the right interpretation of the results of the experiments is that fixed price decisions are tougher decisions for poorer people than for richer people. This interpretation would differ from "poverty impedes cognition" in the decisions of richer people to bigger price tag scenarios. I would expect asking richer people about what they would do if their house were destroyed in a plausible way not covered by their insurance would induce a similar cognitive impairment.
