It totally does mention that their scores changed after they got the harvest... they went up, presumably because the cognitive burden was gone. Similarly, the e

It totally does mention that their scores changed after they got the harvest... they went up, presumably because the cognitive burden was gone. Similarly, the experiment with car repairs of different expenses showed that the cognitive impact is correlated to how 'bearable' an expense was: rich people weren't impacted by a thousand dollar repair, but poor people suffered an impairment that wasn't there when the repair was only $100. This is pretty clear evidence that they didn't just pick a bunch of dumb poor people: the poor people started performing worse when there was financial pressure. This could probably be extended to test the impact of financial pressure on 'rich' people: propose they're hypothetically unemployed, or disabled and see if this has a cognitive impact. The problem is that rich people don't deal with that kind of problem with any regularity, so they might be able to shrug off a hypothetical situation.