Account must also be taken of how the various components of the taxation system interact: indirect taxation with forms of low-income support; direct taxation with detractions and deductions; income support with employment incentives; interactions between the various exceptions to the general taxation regime envisaged for each taxable base; and between these components and the fight against tax evasion, taking full advantage of all the available technologies.
Fundamental structural features of the economy, known by more familiar names such as the "natural rate of unemployment", "potential output growth", "neutral real interest rate" – what FED Chairman Mr. Jerome Powell called the "stars"1 – change location significantly over time, making "navigating by the stars" rather challenging.