Because the entitlement to OAS does not change with the date of retirement, the effect of the OAS on the retirement decision is limited to the impact of the 15- percent clawback. [...] The Interaction of the CPP/QPP and the GIS A subtle yet strong effect of public pensions on the incentive to work comes from the interaction of the CPP/QPP with the GIS. [...] The simulations reveal that the interaction between the CPP/QPP and the GIS is a major contributor to the incentive to retire. [...] For this reason, much of the 9 The worth of the actuarial adjustment is also affected by the clawing back of other benefits in addition to the GIS. [...] The illustration is set in 2002, making both men 60 years of age, and the calculations incorporate the CPP, the GIS, and the OAS, as described in the appendix.12 The sole difference between the two men is that Mr.