IntroductIon Dear Readers and Authors, We present to you the last issue of 2017 of the scientific quarterly Copernican Journal of Finance & Accounting. At the beginning we would like to give special thanks to everyone, who has contributed to the continuous development of the journal. We hope that this issue, in which we present articles from various areas of finance, will be an interesting for you. Scientists recognise the challenges fac- ing contemporary finance and the economy by developing and the deepening research in this area. Among the matters covered in this issue are the shadow economy, cashless transactions, sovereign bond market, green bonds, and the relationship between asset and profitability with share value. We are open to all scientists from all countries and universities who con- duct research in the area of interest of our journal. We encourage you to ex- change and publish the results of your research in our Copernican Journal of Finance & Accounting. Executive Editor, Dorota Krupa, Ph.D.