The union of Merrill Lynch's and BlackRock's asset management arms, the biggest deal ever, is likely to continue to boost the stocks of publicly traded asset management firms, Bloomberg reports. In fact, over the past year, shares of the world's 50 biggest money firms have risen an average 42% 3/4 nearly four times the Morgan Stanley Capital International's World Index.

Pacific Management (up nearly 300%), Aberdeen Asset Management (up 119%), BlackRock (up 82%), Legg Mason (up 67%) and Franklin Resources (up 41%) have seen some of the biggest gains.

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