Why do Japanese coins have holes in them?

Related questions

1. What is the function of CBN?
2. Is Gabon a dictatorship?
3. What does ear cancer look like?
4. Why do Chinese coins have a hole in the middle?
5. Who is CBN president?
6. How long does Chinese New Year go for 2018?
7. How much does a meal cost in China?
8. Who has the highest currency?
9. Why do countries peg their currency to the dollar?
10. How much does a Mcdonalds meal cost in China?

Tags

1. #japan
2. #cheaper
3. #tread
4. #first
5. #about
6. #controversy
7. #harder
8. #metal
9. #because
10. #which
11. #minted
12. #coins
13. #counterfeit
14. #holes
15. #carefully
16. #there