PowerShares makes powerful push with innovative ETFs
Larger rivals have forced others to develop niche products tied to everything from steel to India to pharmaceuticals
A decade ago, exchange-traded-fund company PowerShares was a tiny entrant in a field dominated by two giants.
Today it is No. 4 in the industry and swatting at a swarm of some 40 smaller competitors.
Now called Invesco PowerShares Capital Management LLC because of its 2006 acquisit
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