(9)Cash penalties should be calculated for each business day for as long as the fail persists. The possibility of a negative interest rate environment should be taken into account when defining the parameters for the calculation of cash penalties. Eliminating any adverse incentives to fail that could arise in a low or negative interest rate environment is necessary in order to avoid unintended effects on the non-failing participant. The Commission should, on a regular basis, review the parameters used to calculate cash penalties and should, as a result, consider potential changes to the method used for the calculation of those penalties, such as setting progressive rates.