Laszlo Goerke (Eberhard Karls Universität Tübingen) & Marco Runkel (University of Munich, Department of Economics) have published Profit Tax Evasion under Oligopoly with Endogenous Market Structure, 59 Nat’l Tax J. 851 (2006). Here is the abstract:

This note investigates the impact of profit tax evasion on firms’ output decisions in a Cournot oligopoly setting in which the market structure is determined endogenously. It is shown that tax evasion intensifies market entry and raises aggregate output, while production of each incumbent firm decreases. Therefore, tax evasion choices affect activity decisions and an evadable profit tax distorts the market outcome.