The main reason Australia's economy collapsed right before the Great Depression began is because the government made poor decisions. Many factors led to their economy collapsing but they can be summed up by the government made poor decisions.
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The index of leading indicators is used to predict changes in business cycles. The correct option among all the options that are given in the question is the first option or option "a". It is basically used to predict the future of the upcoming economy. It can also be said that it does not always yield the perfect result.
Answer:
Presidential - a system of government where the executive branch exists separately from a legislature (to which it is generally not accountable).