english: His most significant works are his contributions to social choice theory, notably Arrow's "impossibility theorem," and his work on general equilibrium analysis.
non_english: Karyanipun ingkang paling wigati inggih punika sumbanganipun wonten ing teori pilihan sosial, utamanipun "teorema ketidakmungkinan Arrow," lan karyaipun babagan analisis keseimbangan umum.