Optimism about economic growth and strong corporate profits is pushing fund managers back into risky assets at a record pace, according to a monthly Bank of America survey, the Internet reported. Surveys show that in three months, the risk level in investors 'portfolios has reached the highest level since 2001, and investors' allocation to U.S. and European stocks and technology stocks has increased significantly. The July survey showed that investors 'allocation of U.S. stocks increased by the largest since December last year. Allocation of technology stocks also recorded the largest three-month increase since 2009. In addition, the degree of overallocation of eurozone stocks reached its highest level in four years.