Topple rate
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Topple rate is a name of a ratio of speed at which firms lose their leadership positions.
For example, the minicomputer industry began, grew up, got big, profitable, smug, senile and died in 20 years from 1975 to 1995. Digital Equipment Corporation is a prime exemplar. In this case the topple rate of the minicomputer industry was 20 years.
Topple rate is especially frequently used in fields of technological business.
See also
Red Queen's race for evolutionary similarities. To maintain a leadership position, an industry must change at the same or faster rate than competing industries.