In our consumer society where practically everything can be bought and sold the money still preserves strange and even weird format in some countries. It seems that the times of stones and furs serving as money are gone, but still not all nations accept the usual paper and metal money.
For instance, the Vietnamese Green Marks differ considerably from the money we are used to spend. You can not pay with these Marks for everything you want as the item which can be purchased by using them is indicated on the money itself. On the edges of Marks there are special tear-off coupons which can be 3exchanged on particular things only.