A very interesting paper, given that the methodology used by the authors was not previously used for this type of research - Panel Threshold Regression (PTR). The authors pointed to the fact that it is necessary that - agencies dealing with the evaluation of the sovereignty of states based on securities and other economic indicators, (such as Moody's) - must make their evaluation criteria more stable and responsible. The paper recommends that this can be achieved by equalizing the weights associated with certain variables in the process of evaluating countries. This would improve the credibility of sovereign ratings, as well as the ability of agencies to predict the decline of government securities and the appearance of outstanding debts in the earliest stages. A very significant contribution of the paper is that it is pointed out that each region, in relation to the sovereign rating of the countries (which are the subject of research), should have different indicators. In addition to the really extensive research that was conducted on 29 countries, the authors also contributed in the form of recommendations to countries that want to improve their rating. The paper is professionally written in accordance with academic writing and meets the criteria to be published in a Sustainability journal.