This paper tries to quantify the significance of credit rating agencies when it comes to developed countries and their need for money. Theoretically, credit rating is closely related with the interest rate and a change in the rating will affect the price of borrowing money that government has to pay (interest rate), and that causes changes in the private sector because nobody within the country can have higher rating than the country itself does. When a situation like lowering the credit rating of the country happens it causes a growth of the interest rate because the risk is higher now for those who lend the money. The empirical research confirms the correlation between interest rate and the share of debt in the GDP. In fact, the countries we observed had an immediate response to the change of rating by rating agencies, and interest rate changed almost simultaneously. Furthermore, the interest rate oscillated more the more often credit rating changed. As far as the share of debt in GDP is concerned, the negative correlation is also visible. When the change of rating had already happened, at the same time the access to the market of capital changed. When the economies around the world collapsed, the credit rating also collapsed and they had to find another source of financial resources. By doing so, the share of debt in GDP kept growing until the economies were more stabilized and that resulted in the decline of the interest rate while the credit rating of the country remained unchanged. With the both countries that were observed it led to change in price (the decline of interest rate) of financial resources they borrowed, even though the credit rating remained the same. That means that, if the economy stabilizes in the country, the trust of the investors rises and with that they are more willing to invest in that country. Besides this, there is a visible negative correlation between the credit rating and the rate of unemployment in the country.