We are very pleased to publish this Special Issue in honor of John Roemer with contributions from excellent researchers in Social Choice and Welfare. Most regrettably, two articles that had been submitted and accepted for the Special Issue, were by mistake published in regular issues:

Brady RL, Chambers CP (2016) A spatial analogue of May’s Theorem. Soc Choice Welf 47(1):127–139. doi:10.1007/s00355-016-0949-0.

Bossert W, Suzumura K (2016) The greatest unhappiness of the least number. Soc Choice Welf 47(1):187–205. doi:10.1007/s00355-016-0951-6.

Both articles are reprinted with their original content, except for the footnote on the front page to inform about the reprint, in this Special Issue. The different DOIs of the original version and its reprint have been linked in both cases.

We regret the mistake that led to the premature publication of those two special issue articles and apologize for any inconvenience caused.