For white collar it's probably a different story. These are people the book mentions, bachelors or married couples choosing not to have kids for 'selfish' reasons. They have the money to thrive and experience as much personal pleasure as they want, be it in consumerism or plain free time, and don't want children to take away from that. But for retail workers, If one day doesn't break the bank (due to their low income already disqualifying them from taking on too much of a debt obligation), and a day working retail is another day of pure agony, they're more likely to take the hit by calling out sick or not showing up to instead do the things they want to do.
