The Purpose of Fiat Currency

Money is not the problem. It is not evil. It allows us to conveniently purchase what we want, when we want it. Thousands of years ago, there was no currency or trading forex. People had to travel for miles to trade their goods. When they got to their destination, there was not guarantee anyone had what they wanted and vice versa. Today, we do not have to worry about it. We can travel where we want and buy what we want, as long as one has the money to purchase goods.
Money represent ones production. It is not what is actually produced. When you go to work, you actually do work and for that work you get a paycheck. You go to the bank and cash your paycheck and then you can go buy food.
Countries of the world all have their own currencies. If you want to go to Italy and spend money, you would it change your money for Euros. Depending on what the exchange rate is, you may not get the same amount back. You may get more or less. You can see that taking a cargo full of chickens to Europe would be very inconvenient. It is much easier to take money out of your purse and spend it.
The use of money came about because it is practical. It is much easier than taking around good some are providing some service. Where the money system has downfalls, is when the money supply is manipulated though online forex transactions. The world bankers can crash or even inflate an economy, if it doesn't agree with their monetary policy. This is where the evil exists. It is not outside of their realm it is within it. Also, money is bought and sold in order to profit. This is not entirely ethical either, especially if the purpose is to cause harm or to damage a country.