Explanation:

- Alfred Marshall (Option 1): A prominent economist known for his work in neoclassical economics, he did not use the term 'micro' for microeconomics.

- Kenneth Boulding (Option 2): An economist and systems theorist, but not credited with introducing the term 'micro'.

- John Maynard Keynes (Option 3): A key figure in macroeconomics and economic theories related to governments and national economies.

- Ragnar Frisch (Option 4): An economist who coined the terms 'microeconomics' and 'macroeconomics', recognized for his contributions to econometrics.