Platinum and Iridium plugs perform at a lower level than copper spark plugs, because they are less conductive and they tend to overheat. However, the overall longevity of these two types of metal is better than copper plugs.
Carrying cost of inventory is often described as a percentage of the inventory value.This percentage could include taxes, employee costs, depreciation, insurance, cost to keep items in storage, opportunity cost, cost of insuring and replacing items, and cost of capital that help produce income for a business.Also referred to as inventory cost.his percentage could include taxes, employee costs, depreciation, insurance, cost to keep items in storage, opportunity cost, cost of insuring and replacing items, and cost of capital that help produce income for a business. Also referred to as inventory cost.
Storage costs (generally expressed as a percentage of the spot price) should be added to the cost of carry for physical commodities such as corn, wheat, or gold. The cost of carry model expresses the forward price (or, as an approximation, the futures price) as a function of the spot price and the cost of carry.torage costs (generally expressed as a percentage of the spot price) should be added to the cost of carry for physical commodities such as corn, wheat, or gold. The cost of carry model expresses the forward price (or, as an approximation, the futures price) as a function of the spot price and the cost of carry.