The factor used to determine the premium. Rates may be based on each $100 of insurance, each $100 of payroll or receipts, each 100 square feet of area, etc. This word is often used to denote premium, but, strictly speaking, premium is the actual amount paid by the insured and rate is the factor used to determine this amount.
Also, the price of insurance for one year per unit exposure, distinguished from the premium. Just as commodity prices are quoted in terms of cost per pound, per dozen, per quart, etc., insurance prices or rates are quoted in terms of cost per unit, depending on the kind of coverage.
In workers' compensation and in manufacturers' and contractors' liability insurance, the unit is $100 of payroll; in burglary insurance, the unit is $1,000 of insurance; in automobile liability insurance, the unit of exposure is one motor vehicle of a particular classification; in product insurance, the unit is per product, or per $10,000 of sales, etc. From the standpoint of rate making, manual insurance rates are made up of two parts, the pure premium and the expense loading.