Whether you put your money in a piggy bank or a bank account doesn't impact the productive capacity of an economy. Keep in mind that money can be created out o

Whether you put your money in a piggy bank or a bank account doesn't impact the productive capacity of an economy. Keep in mind that money can be created out of thin air and that's effectively what would happen if enough people cashed out - it would reduce the supply of money and the central bank would make up for it until the desired level as measured by inflation would be reached. Other than some volatility this would create if it was coordinated, it would have little impact on the real economy.