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Consider a coordination game, in which actions taken by players are strategic complements. Moreover, assume that actions are strong strategic complements, in that the slope of the best response function is greater than unity in some range, as demonstrated in the graph below. What is the intuition behind multiple equilibria in such a case? I understand the graphical intuition, but don't see any economic intuition.

Source: https://ocw.mit.edu/courses/economics/14-462-advanced-macroeconomics-ii-spring-2004/lecture-notes/complementarties.pdf

Source for the image: https://ocw.mit.edu/courses/economics/14-462-advanced-macroeconomics-ii-spring-2004/lecture-notes/complementarties.pdf

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