The Editorial Board of the Review of Radical Political Economics votes on the award recipient. The award is given in summer/fall for the Best Paper published in the previous volume year.
This year there was a tie for these two papers published in the 2016 volume year:
Hyeng-Joon Park, “Korea’s Post-1997 Restructuring: An Analysis of Capital as Power” 48(2): 287–309; http://journals.sagepub.com/toc/rrpa/48/2
François-Xavier Devetter, “Can Public Policies Bring about the Democratization of the Outsourcing of Household Tasks?” 48(3): 365–393; http://journals.sagepub.com/toc/rrpa/48/3
More information is here for both papers: http://urpe.org/?page=rrpe&side=browse_content&sub=annual_best_paper