Laffer curve is simplistic in that it assumes a single tax rate and a single labor supply. Actual systems of public finance are more complex, and there is serious doubt about the relevance of considering a single marginal tax rate. In addition, revenue may well be a multivalued function of tax rate; for instance, an increase in tax rate to a certain percentage may not result in the same revenue as a decrease in tax rate to the same percentage (a kind of hysteresis). Furthermore, the Laffer curve does not take explicitly into account the nature of the tax avoidance taking place.
Arthur Laffer Company funded by Tako Ventures, a funding arm of Larry Ellison. In 2008, Laffer joined the Board of Alpha Theory, a non-public Fundamental Portfolio Optimization software for hedge and mutual funds. Laffer recently joined the advisory board of Collabarium Capital. In 2010, Laffer joined the Boards of Executive Trading Solutions, an LLC providing the top technological solution for management of Rule 10b51 stock trading plans, and Consensus Point, a provider of an enterprise prediction markets platform. In 2015, Laffer joined the board of General Employment Enterprises, (JOB), a rapidly growing staffing company located in Illinois. Laffer has branched into writing