How do companies know when things get expired

By checking the expiration date

Explanation:

It is very dangerous to consume either by eating or using, expired products.They are dangerous to health when consumed and a threat to originality when used in producing other products.

The best way to determine expired products in organisations is to have a culture of routine check of produce and products. The check helps to save from the danger of consuming the expired products and also saves from litigation in case the expired product is mistakenly sold out.

i would say a certificate of deposit, so you're not locked into a long term, and it has more security than a mutual fund.