FIFO inventory accounting assumes that the first items purchased or produced are the first ones sold or used.
Therefore, the cost of goods sold reflects the oldest costs of inventory. If a company uses a more expensive shipment of components instead of the lower-cost ones that were previously received, it will increase the cost of goods sold and reduce the gross profit margin. This is because the newer components have a higher unit cost than the older ones, and the cost of goods sold is calculated by multiplying the unit cost by the number of units sold or used. References:
*CPIM Part 1 Exam Content Manual, page 17, section 3.2.1: "Explain the impact of inventory valuation methods (for example, first in, first out [FIFO], last in, first out [LIFO], average cost, standard cost) on financial statements and taxes."
*CPIM Part 1 Study Guide, page 63, section 3.2.1: "The FIFO method assumes that the first goods purchased or produced are the first goods sold. The cost of goods sold is based on the oldest costs, and the ending inventory is based on the most recent costs. The FIFO method results in a higher net income and a higher ending inventory value in a period of rising prices."

Capable-to-promise (CTP) is a type of order fulfillment policy that confirms a customer order based on the available capacity and inventory, as well as the current production plan and schedule. CTP calculates the earliest possible delivery date for a customer order, considering the existing demand and supply situation.
CTP allows a company to accept an order that exceeds the current available inventory, as long as it can produce the remaining quantity within the customer's requested delivery time. CTP helps to improve customer service, reduce inventory costs, and increase production efficiency12. References: 1 Capable to Promise (CTP) - Definition, Calculation, and Examples 3 2 CPIM Exam References - Association for Supply Chain Management

Inventory days of supply (IDS) is a measure of how long it takes for a company to sell its entire inventory.
Reducing IDS means that the company is selling its inventory faster, which increases the inventory turnover ratio. Inventory turnover ratio is the number of times a company sells and replaces its inventory in a given period. A higher inventory turnover ratio indicates that the company is more efficient in managing its inventory and generating sales. Reducing IDS also means that the company is reducing the time between paying its suppliers and receiving payment from its customers, which reduces the cash-to-cash cycle time.
Cash-to-cash cycle time is the number of days a company's cash is tied up in its operations. A lower cash-to-cash cycle time indicates that the company is more efficient in converting its inventory into cash and improving its liquidity. Therefore, reducing distribution network inventory days of supply will have the impact of increasing turnovers and reducing cash-to-cash cycle time. References:
Gartner's Top Actions for Supply Chain Inventory Reduction
Inventory Days Of Supply | Supply Chain KPI Library | Profit.co
Maximizing Efficiency: Understanding Inventory Days of Supply in - oboloo