This approach was developed further by Robert Barro and Herschel Grossman in their 1976 volume, Money, Employment, and Inflation, but began to go out of use and fashion in the 1980s.11  7. Surprising omissions.
The best way to learn how to check the authenticity of a euro banknote is to explore the security features showcases. And why not investigate the showcase displaying the different steps in banknote production or try to lift the weight of a gold bar? Sofia is the 11th city to play host to the Euro Exhibition.