Flat Commission

Remuneration paid to an Agent of the basis of a straight percentage of premium for all types of risks and policies as compared to a graded scale of separate percentage for different types of policies.
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A standard commission that is paid to the insurance agent no matter what kind of policy has been sold.

Flat line (or first interest) reinsurance

Marine insurance whereby the reinsurer receives all of the cedant’s interest up to a predetermined amount. For example, if an underwriter accepts £100,000 on a vessel and reinsures £50,000 on a first interest basis, any amount ‘closed’ up to £50,000 will be ceded to the reinsurer. If only £80,000 is closed to the underwriter it is his share of the risk that goes down as the reinsurer’s line holds good in the sum of £50,000.