And working some more numbers, $100 in a day (full-time shift of 8 hours) would be $12.50/hour. Which works out to $26,000/year. About 48% of individuals earned less than that in that year.
Yet Another Edit (YAE): At $26k/year a single individual with no dependents wouldn't actually be making $100/day. Like the poorer minimum-wage earners, they'd be losing SS and Medicare taxes. At that income they're also paying income tax and not (necessarily) getting it all back (like the minimum-wage earners would). If my brain engages I'll work the numbers for a single individual to actually get to bring home $100/day (ignoring state income taxes).
Note: I'm tired, may be misreading the intro block to the table, but this doesn't seem to be including the unemployed or those under the age of 15 and only those who report income (so those getting paid under the table aren't affecting the percentages).
[1] http://en.wikipedia.org/wiki/Personal_income_in_the_United_S...
[1] http://en.wikipedia.org/wiki/Household_income_in_the_United_...
[2] http://en.wikipedia.org/wiki/Personal_income_in_the_United_S...
$100 is way less than "a few days' wages" for most people in the US/EU, right?