The purpose behind this clause is simply to give the Landlord two options in the event that more than one Tenant signs the Lease Agreement. In such an instance, should Rental not be paid, the Landlord has the option to either take action against one of the Tenants for the full amount, or both of the Tenants together in whatever ratios he deems appropriate. This clause means that the Landlord is not obliged to split the arrear Rental between the parties in equal proportions, which is particularly important when it becomes obvious that one Tenant is experiencing financial difficulty, but the other is able to pay. The paying party would then claim the portion that he or she was not responsible for from the non-paying party.