Ethanol producers and health-care service providers are among the potential corporate beneficiaries of policies proposed by President Bush, while domestic automakers and oil companies could get slightly stung.

Ethanol companies' stocks fell Wednesday afternoon, however, signaling investors' skepticism about whether the proposals laid out in the State of the Union address  are achievable politically, and even technologically. Economists said they expect few drastic changes in the Democrat-controlled Congress between now and the 2008 election.