D. Lukyanov

It is well known from the finance theory that “profit” and “risk” terms always go hand in hand, as in case of change of any parameter the other one changes as well. There are a lot of theoretical and applied researches based on the classic “Portfolio Theory” of Harry Markowitz describing a combination of risky and risk-free assets (practical financiers also widely use the William Sharpe ratio).

In the financial world occurrences which have not found their expression in fundamental scientific works yet regularly appear and persist for a long time. Let’s consider the most interesting and fundamental ones.