Trickle-down economics was an economic policy supported by:

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A. Jimmy Carter.

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B. Lyndon Johnson.

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C. Ronald Reagan.

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D. Bill Clinton

C. Ronald Reagan, "Reaganomics was influenced by the trickle-down theory and supply-side economics. Under President Reagan's administration, marginal tax rates decreased, tax revenues increased, inflation decreased, and the unemployment rate fell."

C. Ronald Reagan.

Explanation:

Trickle-down economics is a theory that believes that tax cuts for the richest will in the end benefit all. Tax cuts on businesses, high-income earners, capital gains and dividends are supposed to stimulate growth. It assumes that investors, big stockholders and owners are the real drivers of growth. After the cuts, they invest and then create more jobs, expand operations and drive demand upward; thus they create prosperity for all.

These were the policies of the Ronald Reagan's administration, or Reaganomics, in the 1980s.