January 2019
We study the outcome of the amendment voting procedure based on a potentially incomplete preference relation. A decision-maker evaluates candidates in a list and iteratively updates her choice by comparing the status-quo to the next candidate. She favors the status-quo when the two candidates are incomparable according to her un-derlying preference. Developing a revealed preference approach; we characterize all choice functions that can arise from such a procedure and discuss to what extent the underlying preference can be identified from observed choices.