Before revision:  The model is parsimonious, requires only two parameters to fit a specific financial time series , and can be grounded in a straightforward framework where volatility fluctuations are driven by the estimation error of an exogenous Poisson rate.
After revision:  The model is parsimonious, contains only two parameters to fit a specific financial time series , and can be grounded in a straightforward framework where volatility fluctuations are driven by the estimation error of an exogenous Poisson rate.