Final answer:
Agriculture, manufacturing, and big retail chains like Wal-Mart play significant roles in job creation and economic dynamics.
Explanation:
Agriculture used to be the dominant force in the U.S. economy, providing plentiful jobs but now employs fewer people due to advances and changes in technology and society.
Manufacturing contributes significantly to the GDP and job market with sectors like biotechnology, aviation, and retail showing growth.
Wal-Mart and big retailers impact local economies by providing jobs but may not keep profits locally, affecting wage levels and benefiting from low-cost labor.
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