Some type of money has an expiry date. Not sure how it works in other countries but here (France) we have "restaurant coupons". You get these issued from your e

Some type of money has an expiry date. Not sure how it works in other countries but here (France) we have "restaurant coupons". You get these issued from your employer. You pay half their value and then you can use them to pay for food, at the grocery store, restaurant, fast food, etc. They are physical coupons so even though there is your name on it you can treat them as parallel money: you can trade them, give them away, etc. They have an expiration date, they only last until the beginning of the following year. So usually if you have many of them left and the expiration is near (you can only use two at a time and they are less than 10€ each) there is a lot of trading or donations between family members to make sure they don't go to waste.