For proper valuation of risk to which the portfolio of financial assets is exposed, it is necessary to forecast the second moments of financial time series, that is variabilities. The empirical investigations show that financia time series are heteroskedastic, i.e. their volatility is not...

The concepts of creativity and innovation are essential in understanding and development of entrepreneurial behavior. Conceptualization of these phenomena in economic science has been relatively slow and with certain delaying in relation to conceptualization of entrepreneurial behavior. The...