DERIVATIVES

AIM: Proposed rules seek to prevent another blowup in that market

IMPACT: Companies may pay extra for basic contracts

COMMODITIES

AIM: To stop speculators, regulators have limited holdings

IMPACT: Individuals have fewer investment choices

HIGH-FREQUENCY TRADING

IM: Lawmakers may curb trading firms that use superfast computers

IMPACT: The cost of retail trading could rise

Data: BusinessWeek

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