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Presidential Election Cycle Theory: A theory that stock market trends can be predicted and explained by the four-year presidential election cycle.

Normal Backwardation Theory: Holds that the futures price will be bid down to a level below the expected spot price.

Odd-Lot Theory: The theory that profits can be made by making trades contrary to odd-lot trading patterns, since odd-lot investors have poor timing. This theory is no longer popular.

Operating Cycle: The average time between the acquisition of materials or services and the final cash realization from that acquisition.

Node Cycle: Period of approximately 18.61 Julian years required for the regression of the Moon's nodes to complete a circuit of 360° of longitude. It is accompanied by a corresponding cycle of changing . . . View Full Definition

Optimal Foraging Theory: A theory designed to predict the foraging behavior that maximizes food intake per unit time

Natural Selection: The process of differential survival and reproduction of fitter genotypes; can be stabilizing, directional, or disruptive. Better adapted individuals are more likely to survive to reproducti . . . View Full Definition

New Werner Motorcycle: Unveiled at the 1901 Cycle & Motor Show in Paris, the “New Werner” is one of the early motorbikes to have its engine mounted in the lower part of the frame (most motorcycles since then use t . . . View Full Definition

Mystery Cycle: A collection of mystery plays in a single manuscript meant to be performed sequentially. See discusion under mystery play, below.

Option Cycle: The cycle of option expiration months. The most common cycles are: January, April, July, and October (JAJO); February, May, August, and November (FMAN); and March, June, September, and Decem . . . View Full Definition