It's called competition - it's the reason you get to sit there and type away on an incredible machine at a very low cost and eat food at a very low cost... The vast majority of businesses are operating on thin margins. Get in the real world, not some fantasy land.
The vast majority of companies can afford sick days for their workers. It's even good for morale, job satisfaction and performance.
Ones that choose not to treat their workers with basic dignity are badly managed.
I'm typing this on a Macbook Pro, which is made by Apple with their net profit margin of 24.3% for Q4 2024. BNSF, one of the companies which is the topic of this conversation, has an operating ratio of 68% for 2024 (how much of their revenue goes towards operational costs). Their net income was $5 billion. They can afford to have a little extra employees to cover fucking sick leave.
> Get in the real world, not some fantasy land
Get out of a libertrarian's wet dream and look around you, read up a little bit on various companies financials.
Competition is not the reason. The reason is workers choosing to improve things, invent things and make things more efficient. Competition is a way to incentivize people to do that, but it's not the only way.