Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Why don't banks print their own paper money / bank notes? 
Who says they don't? In the United Kingdom the Bank of England and the Bank of Scotland print the money. In some other countries (like Hong Kong, Israel, and the US) commercial banks were issuing the currency at some point of time, but now the governments do that. The problem with commercial banks issuing currency is the control. If a bank is allowed to print money - how can the amount of currency be controlled? If it is controlled by the government then the bank will be just a printing press, so what's the point? And since governments now want to control the monetary policy, banks have no reason to just be printing presses for the government, the governments have their own. edit Apparently in Hong Kong it is still the case, as I'm sure it is in some other places in the world as well.