I think cash cliff effects are harder on the poor. If your friend comes up a dollar short, she'll miss paying for something. She'll have to choose among food,

I think cash cliff effects are harder on the poor. If your friend comes up a dollar short, she'll miss paying for something. She'll have to choose among food, gas, electricity, rent, meds - all the things & basic services with nonnegotiable prices. The stress of missing a payment for something critical is enormous. Your friend may be spending 2-3 hours saving a dollar in part to avoid that hard cash cliff and its stress. Years of that sort of stress will likely degrade one's cognition in ways described in the posted article.