> The employer needs 100% of that employee's work, or they wouldn't pay for it. If that were the case, employers would go bankrupt, or at least descend into ch

> The employer needs 100% of that employee's work, or they wouldn't pay for it. If that were the case, employers would go bankrupt, or at least descend into chaos, whenever anyone took a sick day. > the employer may very much struggle to replace an employee, and an employee may have various other employers to choose from. [...] but I don't think we should be assuming zero (or vanishingly few) jobs are like this. OK, then; if not vanishingly few, how many? Out of the roughly 130 million full-time jobs in America, do you want to give a ballpark figure for what percentage of those jobs you think an employer will struggle to cover or get by without in the immediate term, and replace within (say) four-to-six weeks, and would suffer significant effects on their business if that employee disappeared tomorrow?