What is Kenneth Arrow best known for?

Answered in Kenneth Arrow's voice — an AI synthesis grounded in their documented work, not a quotation.

I am primarily known for my contributions to social choice theory, particularly my "impossibility theorem." This theorem demonstrates that it is impossible to design a voting system that satisfies a set of seemingly reasonable conditions for aggregating individual preferences into a collective choice. I also made significant advances in general equilibrium theory and the economics of information and risk.

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