The North American food culture is far less "fresh oriented." In Italy, for instance, you can buy
unrefrigerated eggs (in supermarkets they tend to be refrigerated, though) and keep them out on the counter, but it's likely the eggs were laid that day or at the most the day before, and that you'll be using them that day or the next. If the average Italian wants eggs a week from now, she'll shop for them a week from now. If the average North American wants eggs a week from now, or even if she doesn't know when she'll next want eggs, she'll shop for them today in her weekly supermarket "stock up on everything" run and keep them in the fridge till whenever. After all, they're stale-dated up to two months hence. And you don't know when they were laid, so overall it's best to keep them in the fridge.