Financial innovations in municipal securities markets

Purpose - The purpose of this paper is to measure how frequently innovative financial products appeared or became widely adopted in the municipal securities markets over the last two decades; and also investigate what types of issuers adopted the innovations, the relationship between yields and innovation and the patterns of diffusion within states. Design/methodology/approach - Using comprehensive data on municipal securities issued from 1992 to 2015, the author searches for financial innovations as defined in the literature. The author uses issuer fixed effects models to characterize the relationship between yields and use of innovative products. Other models provide estimates of the conditional correlations between issuer characteristics and innovation usage. Finally, the author fits trend models to identify significant differences in the pace of adoption between different types of issuers. Findings - In total, 35 security features fit one or more definitions of innovation. Extensive analysis is presented for four innovations that represent significant transfers of risk: variable rates, put options, corporate backers and derivatives. Small issuers used these innovative products, but the largest issuers adopted them to a greater extent. Usage appears to diffuse within states. Issuance of innovative securities fell during the financial crisis and has not recovered. Novel securities since the financial crisis have been created by legislation rather than by market participants. Research limitations/implications - The data appear to cover all or nearly all municipal securities, but they do not cover loans or other types of municipal borrowing. Practical implications - This analysis reveals that financial innovations in municipal securities markets usually take the form of a rare practice becoming widespread rather than a never-before-seen feature appearing in the market. Changes in response to legislation are an exception. Social implications - Regulators concerned about financial stability can monitor the expansion of formerly rare securities features. This will be informative about new risks or transfers of risk in the market. They can also anticipate that expanded use of an innovation by states and high-volume issuers will be followed by adoption of the innovations by smaller, less sophisticated issuers in subsequent years. Originality/value - This paper is the first attempt to empirically analyze the extent of financial innovation in municipal securities. Existing public finance literature has proposed definitions of financial innovation, qualitatively documented some specific innovations and empirically analyzed others. However, no previous study has empirically analyzed the entire municipal securities market for all possible innovations.