Securities and Exchange Commission Chairman William Donaldson cast the deciding vote Wednesday to extend a widely opposed rule that guarantees all investors get the best price on electronic stock trades.

The plan was opposed by companies, including discount broker Charles Schwab and Fidelity Investments, that were concerned the measure would make it more difficult to buy large blocks of stock at a desired price. Rep. Richard Baker, R-La., a prominent member of the House Financial Services Committee also contested the proposal.

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