context: As financial assets became more and more complex, and harder and harder to value, investors were reassured by the fact that both the international bond rating agencies and bank regulators, who came to rely on them, accepted as valid some complex mathematical models which theoretically showed the risks were much smaller than they actually proved to be. George Soros commented that "The super-boom got out of hand when the new products became so complicated that the authorities could no longer calculate the risks and started relying on the risk management methods of the banks themselves. Similarly, the rating agencies relied on the information provided by the originators of synthetic products. It was a shocking abdication of responsibility."
question: জটিল অর্থনৈতিক উদ্ভাবনের পণ্যগুলির ঝুঁকি প্রকৃতপক্ষে যতটা প্রমাণিত হয়েছিল তার চেয়ে কম দেখিয়ে কে বিনিয়োগকারীদের আশ্বস্ত করেছিল?
answers: international bond rating agencies