"Financial innovation has been both praised as the engine of growth of society and castigated for being the source of the weakness of the economy. In this paper, we review the literature on financial innovation and highlight the similarities and differences between financial innovation and other forms of innovation. We also propose a research agenda to systematically address the social welfare implications of financial innovation. To complement existing empirical and theoretical methods, we propose that scholars examine case studies of systemic (widely adopted) innovations, explicitly considering counterfactual histories had the innovations never been invented or adopted"--National Bureau of Economic Research web site.