Aggregation rules relate to the decision making process that is necessary to move forward. For instance, an asymmetric aggregation rule might see one participant have veto power while others do not. As Ostrom and Crawford (2005) note, “aggregation rules are necessary whenever choice rules assign multiple positions partial control over the same set of action variables.” (202). This situation describes IGR in Canada, since decision making is inherently multilateral. Moreover, IGR tends to operate on a consensus basis (with certain exceptions), meaning that it follows symmetric aggregation rules.
