Sweden's 1967 Switch to Right-Hand Traffic

Stable Equilibrium

Unstable Equilibrium

For generations, all commuters in a city have used the 'North Bridge' to cross a river, leaving the identical 'South Bridge' almost empty. There is no toll, law, or physical barrier that prevents using the South Bridge. Which statement best analyzes why this traffic pattern is a self-perpetuating state?

Market Adoption Failure

Social Conventions as Equilibrium

In a community, two new, equally effective but incompatible messaging apps, 'ConnectApp' and 'TalkNow,' are introduced. After an initial period of mixed usage, nearly everyone adopts 'ConnectApp,' and 'TalkNow' falls into disuse. Which of the following statements provides the most robust evaluation of why the widespread adoption of 'ConnectApp' represents a self-perpetuating equilibrium?

Consider a town where, by long-standing custom, all shops close on Wednesdays. There is no law requiring this closure. This situation is not a true self-perpetuating equilibrium because any single shop owner could gain a significant advantage by choosing to stay open.

Evaluating the Stability of Social and Technical States

Each of the following describes a stable or recurring situation. Which one of these is LEAST likely to be considered a self-perpetuating equilibrium?

Match each scenario with the statement that best describes the nature of its stability.

A community has long used a standard, but inefficient, technology. A new, more efficient but incompatible technology is introduced. Arrange the following events in the logical order that describes the transition from the old, stable state to a new one.

The Persistence of an Inefficient Standard

Unstable Equilibrium

Housing Market Dynamics

A new social media platform experiences a small, initial increase in its user base. As more people join, the platform becomes more valuable to both new and existing users, because there are more people to connect with. This increased value then attracts even more new users. Which of the following statements best analyzes this situation?

Analysis of a Financial System Cascade

Consider a situation where an increase in a country's national income leads to higher consumer spending, which in turn causes businesses to invest more, further increasing national income. A student concludes that because the system is self-correcting and will naturally settle at a stable, predictable level, it is an example of a positive (reinforcing) feedback loop.

A rumor spreads that a regional bank may be financially unstable. Arrange the following events into the logical sequence that illustrates a self-amplifying cycle leading to the bank's failure.

Identifying a Reinforcing Cycle

Match each description of a system's dynamic behavior with the corresponding principle or example.

In a system where an initial change causes further changes that amplify the original effect, moving the system progressively further from its starting point, this dynamic is known as a ________ feedback loop.

A climate scientist presents a model where initial warming from greenhouse gases causes Arctic sea ice to melt. The reduced ice cover means less sunlight is reflected back into space, and more is absorbed by the darker ocean water. This absorption leads to further warming of the ocean and atmosphere, which in turn accelerates the melting of the remaining sea ice. A student critiques this model, arguing that since the system is changing and not returning to its original state, it cannot be a valid feedback loop. Which of the following provides the most accurate evaluation of the student's critique?

Evaluating an Intervention in a Poverty Trap