ItemArbitrage Free Approximations to Candidate Volatility Surface Quotations(MDPI, 2019-04-21) Madan, Dilip B.; Schoutens, WimIt is argued that the growth in the breadth of option strikes traded after the financial crisis of 2008 poses difficulties for the use of Fourier inversion methodologies in volatility surface calibration. Continuous time Markov chain approximations are proposed as an alternative. They are shown to be adequate, competitive, and stable though slow for the moment. Further research can be devoted to speed enhancements. The Markov chain approximation is general and not constrained to processes with independent increments. Calibrations are illustrated for data on 2695 options across 28 maturities for 𝑆𝑃𝑌 as at 8 February 2018. ItemPricing Product Options and Using Them to Complete Markets for Functions of Two Underlying Asset Prices(MDPI, 2021-08-04) Madan, Dilip B.; Wang, KingOptions paying the product of put and/or call option payouts at different strikes on two underlying assets are observed to synthesize joint densities and replicate differentiable functions of two underlying asset prices. The pricing of such options is undertaken from three perspectives. The first perspective uses a geometric two-dimensional Brownian motion model. The second inverts two-dimensional characteristic functions. The third uses a bootstrapped physical measure to propose a risk charge minimizing hedge using options on the two underlying assets. The options are priced at the cost of the hedge plus the risk charge. ItemA theoretical model on how firms can leverage political resources to align with supply chain strategy for competitive advantage(Wiley, 2022-03-10) Grover, Abhay K.; Dresner, MartinThe success of a firm's supply chain strategy depends on resources in the political environment and the supply network in which it operates. If the political environment is not conducive to a firm's supply chain strategy, a firm can either change its supply chain strategy or seek a political environment that is more favorable to its supply chain. This paper examines this second alternative. The structure-conduct-performance (SCP) paradigm and the competitive dynamics literature are used to explore the relationships between political actions that leverage supply network resources, supply chain strategies, and firm performance. We extend a well-known typology of political actions from the strategic management literature and suggest that beyond influencing or complying with the political environment, firms may choose to moderate the political environment (circumvent or submit) or stay neutral (free ride). An integrated model is developed to explore the relationships between political actions and supply chain strategy, along with a series of propositions outlining how political actions can facilitate supply chain risk management strategies. Finally, suggestions are provided for future research.