The average rent in The U.S. is $1,740(*1), let's say The Average McDonald's, or Walmart employee, and somehow has a full time position (unlikely), they're earning $13.05 (*2) to $14.68 (*3).

At $13.05 × 40 = $522 × 52 = $27,144 (Annual Pay)

$1,740 x 12 = 20,880 (Annual Rent costs)

$27,144 - $20,880 = $6,264 left over ÷ 12 = $522 / month to cover everything else.

Average grocery costs per month is about $300.

So $222 left over to pay taxes, gas, electricity, water, phone bills, college debt, credit cards, car payments, etc.

And that's being generous, the reality is more grim for a lot of people.