Big push – Multiple Equilibria Equilibrium 1 and 3 cut the 45 degree line (the "line of harmony" where individual investment = average investment level) from above. In these cases, the level of individual investment is higher than the expected investment/average investment level of everyone else, and it indicates a stable push to points development levels d1 and d3, as people are spending more than average. Equilibrium 2 is UNstable because you cut from below the 45 degree line, indicating that individual investment is lower than the expected/average before reaching D2. I don't know if this is totally correct game theory wise, but as for the reason the investment level would go back to d1, I'm imagining a scenario where your class was studying for a supposedly difficult exam. However, one person finds out that in order to get an A, you only need to get 4/10 questions right. This
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English-language films, big push, Multiple Equilibria Equilibrium