Why are noodles so valuable?
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Why are noodles worth more than tobacco in prison?

Ramen noodles have overtaken tobacco to become the most valuable commodity in some US prisons.

They can be exchanged for goods, services and are sometimes used as bargaining chips in gambling.

Gustavo "Goose" Alvarez is a former prisoner and has written a cookbook called "Prison Ramen". He told BBC Radio 4's PM why noodles have become such a commodity.

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