Explanation:

- Option 1: Hicks

- John Hicks made significant contributions to the field of economics, particularly in value theory and welfare economics.

- He is known for his work on consumer demand theory but didn't specifically coin the phrase in question.

- Option 2: Keynes

- John Maynard Keynes revolutionized economics with his theories on macroeconomics and fiscal policies.

- He emphasized the role of government intervention in combating economic downturns.

- Option 3: Robbins

- Correct Answer: Lionel Robbins is known for his definition of economics emphasizing choice and scarcity.

- He famously described economics as a science of human behavior, often summarized in logical terms.

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- Option 4: Marshall

- Alfred Marshall was pivotal in shaping microeconomics and introduced concepts like elasticity of demand.

- His focus was more on practical aspects than on economics as pure logic.