Understand the principal differences between investment banks and commercial banks, and the areas of banking services that each provides.
Once you get them home, you can keep them for up to 5 weeks from the purchase date, even if the sell-by date expires during that time. If you purchased the eggs from a farm or farmers market and there's no date, keep them for up to 5 weeks from the purchase date.
The short version: 3-5 weeks in the shell. Healthy. Any egg can go bad, of course, but undamaged eggs will last many weeks in the fridge and I've read studies that have even claimed to have edible eggs after a year at room temperature. I don't refrigerate the eggs that my chickens lay and have yet to see one go bad.