Marine insurers are usually for-profit companies that charge customers a premium to fully cover ships and cargo in the time period when the policy applies. In contrast, a P&I club is run as a non-profit co-operative and the insurance is financed by “calls”. Club members contribute to the club’s common risk pool according to the Pooling Agreement's rules. If the risk pool cannot cover current claims, the club members will be asked to pay a further call. If the pool has a surplus, the club will ask for a lower call the following year or make a refund to members. Only shipowners with acceptable reputations are allowed to join a P&I club and any P&I club member who incurs reckless or avoidable losses to the club may be asked to leave.