Empirical constitutional economics has made a huge leap forward over the last decade. Interesting insights into the effects of constitutions have been discovered. Rather than summarizing the state of the art, this paper identifies some of the current shortcomings and proposes a number of extensions. It calls for recognizing additional constitutional institutions as explanatory variables, as well as the incorporation of additional dependent variables. Its major emphasis is, however, on calling for the next logical step in this field, namely to endogenize constitutions. (C) 2011 Elsevier B.V. All rights reserved.