What is price index number?​

Price index number can be defined as a measure of how the price of goods and services change over a specific period of time.

Explanation:

Price can be defined as the amount of money that is required to be paid by a buyer (customer) to a seller (producer) in order to acquire goods and services. Thus, it refers to the amount of money a customer or consumer buying goods and services are willing to pay for the goods and services being offered.

Generally, the price a consumer (buyer) would pay for goods and services are primarily being set by the seller or service provider.

In sales and marketing, pricing of products is considered to be an essential element of a business firm's marketing mix because place, promotion and product largely depends on it.

Price index number can be defined as a measure of how the price of goods and services change over a specific period of time.

Hence, it's a statistical value (number) that is typically used for expressing the price change of goods and services as a percentage of prices in a base year.

On a related note, the consumer price index (CPI) is a measure used to analyze and examine the weighted average or aggregate of prices of a basket of goods and services paid for by consumers such as medical, food, and transportation.