possibility of risky assets diversification to obtain the optimal return/risk ratio. Consequently, this paper aims to examine the … uncertainty. It is difficult to find a field where the decision making process is risk-free. This statement is especially true in … case of financial investments according to which risk taking is rewarded. But it is also true that the financial market …

methods of measurement of return, risk and the other statistical properties constitute, in fact, the pillars of companies … listed shares. Our analysis concerns the risk which arises from the Markowitz mean-variance approach. Our work method will be …

, but decreased returns volatility. Third, political news, both good and bad, can affect stock return and stock return …

, analyze the effect of corporate reputation on stock return and risk. A model based on firms' financial market data was … reputation on return and risk, being the impact on the risk an area still little explored and with controversial results; thirdly … competitive advantage and on keeping a sustained superior performance. However, the impact of corporate reputation on risk, in …

to take into account both the profitability and the risk associated with the assets, but that used to be done mostly at …, Markowitz showed how efficient portfolios (those that maximize expected profitability at a given risk level) can be put together …

Using a wavelet coherence approach, this study investigates the relationship between Bitcoin return and Bitcoin … index to observe the direct relationship between a change in sentiment and return. Our results robustly reveal that, before … the pandemic, sentiment had a positive efect on return. Although positive coherence still existed during the pandemic, the …

. The second is where each one seeking to maximize his utility function is intuitively constrained to minimize the risk. The …