In order to provide an accurate picture of our economic life as everyday consumers, when measuring the CPI, the economists at KOSIS can: 2 Give more weight to goods and services that are used less by consumers. Include as many goods and services as possible, such as engineering consulting service fee and oil tankers' prices. Not calculate CPI at all because it is not exact anyway. Subtract 2% from CPI to account for the benefit of inflation. Use a recent year as the base year to take into account of any new products