State aid rules play an important role in the management of the single market. State aid is defined as any advantage granted by public authorities through state resources on a selective basis to any organisations that could potentially distort competition and trade in the EU. Unless otherwise permitted, State aid is viewed as incompatible with the single market and is prohibited. However, the Treaty leaves room for the granting of State aid in respect of several policy objectives, considering the possibility of market failures and the need for a well-functioning and equitable economy. For example, of relevance to the agricultural sector and forestry, the Treaty considers aid to make good the damage caused by natural disasters or exceptional occurrences as compatible with the single market.