The hidden cost of a sick shift
A worker who comes in ill may appear to preserve a day’s output, but that calculation counts only the person’s attendance—not the risk their presence creates. If illness spreads to coworkers, one paid absence can become several. Even without transmission, fatigue and discomfort can make tasks slower or more error-prone, shifting costs onto supervisors, customers, and colleagues who have to correct mistakes or cover gaps.
Economists call these spillover effects: one person’s decision imposes costs on others that are not included in the immediate transaction. A worker weighing lost wages against staying home may have reason to show up, even when staying away would protect the workplace overall.
Paying for prevention
Paid sick leave changes that choice by reducing the worker’s personal cost of staying home. For an employer, the day’s wages are visible and immediate; the potential costs of an outbreak or a costly mistake are less certain. But when the work involves close contact, food, caregiving, or tightly coordinated teams, preventing one sick shift from disrupting others can make paid leave the less expensive option.
The bargain depends on circumstances: not every illness spreads, and not every job can easily absorb an absence. The business case is that a paid day off can buy more than one worker’s recovery—it can help keep the rest of the workforce available.
