<P> Ten - Day Price Index </P> <P> Under this method, "sample prices" with high intra-month fluctuations are selected and surveyed every ten days through phone . Utilizing the data retrieved by this procedure and with the assumption that other non-surveyed "sample prices" remain unchanged, a "ten - day price index" is compiled and released . </P> <P> Monthly price indexes are compiled by calculating the simple arithmetic mean of three ten - day "sample prices" in the month . </P> <P> Under this method, "sample prices" with high intra-month fluctuations are selected and surveyed every ten days through phone . Utilizing the data retrieved by this procedure and with the assumption that other non-surveyed "sample prices" remain unchanged, a "ten - day price index" is compiled and released . Calculation Method Monthly price indexes are compiled by calculating the simple arithmetic mean of three ten - day "sample prices" in the month . </P>

What is wholesale price index and consumer price index