Coins Hoarded

Cashing in your pennies? Would this have a positive or negative effect on a countries economy?
Cashing in your pennies?
Everyone has a jar of Pennies… a few coins down the back of the sofa… a hoard of coins in the glove compartment of there car to pay parking etc….
But what would happen if everyone in a country simutatiously (on the same day) cashed every single piece of coin currency into a bank?
Do you think it would it have a Positive or Negative effect on the economy of that country?
Please explain the reasoning for your answer.
Slightly positive as it means banks would have more capital and can issue more loans to spur more economic activity.
But really just a drop in the bucket.
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