A Seasonal Index for a Monthly Series Is About to Be

question 98

Essay

A seasonal index for a monthly series is about to be calculated on the basis of three years' accumulation of data.The three previous July values were 110,135,and 130.The average over all months is 160.What is the approximate seasonal index for July?

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Definitions:

Negative Externality

A cost suffered by a third party as a consequence of an economic transaction in which they were not involved.

Common Resource

A resource like air or water, that provides users with tangible benefits but is difficult to exclude nonpaying users from consuming or depleting.

Publicly Owned

A description for businesses or assets owned by the government or the public sector, often emphasizing their accountability and service to the public rather than profit motive.

Tragedy of the Commons

A situation where individual users, acting independently according to their own self-interest, deplete or spoil shared resources, leading to overall degradation.