In Dow Theory trend hierarchy, how are Primary, Secondary, and Tertiary trends distinguished by time duration and operational significance?

[ A ]Primary trend lasts 1 hour; Secondary trend lasts 10 years; Tertiary trend lasts 50 years.

[ B ]All three trends are identical in duration and last exactly 24 hours from midnight to midnight.

[ C ]Primary trend applies only to commodities, Secondary applies only to real estate, and Tertiary applies only to bonds.

[ D ]Primary trend is the dominant long-term macro trend lasting 1 year or more (Bull or Bear market); Secondary trend is an intermediate correction/rally lasting 3 weeks to 3 months retracing 1/3 to 2/3 of the primary move; Tertiary trend represents short-term noise lasting under 3 weeks.[ CORRECT ]

Takeaway

Option D is correct: Primary trend is the dominant long-term macro trend lasting 1 year or more (Bull or Bear market); Secondary trend is an intermediate correction/rally lasting 3 weeks to 3 months retracing 1/3 to 2/3 of the primary move; Tertiary trend represents short-term noise lasting under 3 weeks.

Derivation

Dow Theory classifies market movements into three distinct hierarchical waves: (1) Primary Trend: The major tide reflecting long-term macroeconomic sentiment and fundamental earnings, lasting one year to several years (establishing broad secular bull or bear markets). (2) Secondary Trend: The waves that interrupt the tide—intermediate pullbacks in bull markets or bear market relief rallies—typically lasting 3 weeks to 3 months and retracing 33% to 66% (one-third to two-thirds) of the prior primary advance/decline. (3) Tertiary (Minor) Trend: The ripples on the surface—short-term fluctuations lasting from a few days up to 3 weeks, reflecting daily news noise. This tests trend hierarchy. A common error is misclassifying secondary corrections as permanent primary reversals.

Why the others fail

A — Primary trend lasts 1 hour; Secondary trend lasts 10 years; Tertiary trend lasts 50 years.

This option completely inverts time horizons; primary trends span years, whereas tertiary trends span days to weeks.

B — All three trends are identical in duration and last exactly 24 hours from midnight to midnight.

Trends operate across multi-tiered multi-timeframe horizons rather than being constrained to identical 24-hour daily periods.

C — Primary trend applies only to commodities, Secondary applies only to real estate, and Tertiary applies only to bonds.

The three trend levels apply across all asset classes (equities, bonds, commodities, currencies) in securities technical research.