When culture does not matter : experimental evidence from coalition formation ultimatum games in Austria and Japan / Akira Okada and Arno RiedlInefficiency and social exclusion in a coalition formation game : experimental evidence / Akira Okada, Arno RiedlWhen culture does not matter : experimental evidence from coalition formation ultimatum games in Austria and Japan / Akira Okada, Arno RiedlInefficiency and social exclusion in a coalition formation game / Akira Okada, Arno Riedl