Maxim Bouev is vice-rector for strategic development at the New Economic School (NES), Moscow. Before NES Bouev worked on the financial institutions team in the investment banking division of N.M.Rothschild & Sons, on the FX quantitative analytics teams of ABN AMRO Bank and the Royal Bank of Scotland in London. After that he returned to academia, taking up primarily administrative roles since 2012. He was head of the Department of Economics of the European University at St. Petersburg when moved to NES – the leading private graduate economics school in Russia – in 2018. Bouev’s research interests are broad ranging from labour to financial markets. More recently he has been interested in theories of search, matching and sorting, issues of financial asset pricing, asset and liability management, risk management. In 2013-2020 he ran a fortnight popular column in the leading Russian business-daily Vedomosti, and is a co-author of a two-volume monograph on the history and philosophy of modelling in finance published by Nauka in 2020 (in Russian). Bouev holds a DPhil in economics from the University of Oxford, UK.
The authors consider the problem of finding a valid covariance matrix in the foreign exchange market given an initial nonpositively semidefinite (non-PSD) estimate of such a matrix.