摘要：We assess whether two classes of bubbles occur in the spot price of gold, rational speculative and periodically bursting bubbles, using gold's lease rates for the first time in the literature as a measure of its fundamental value. This question is of particular significance as these are the only observable market measures of a yield that can be earned from gold. We use unit root and cointegration tests to look for rational speculative bubbles and Markov Switching Augmented Dickey–Fuller tests for periodically bursting bubbles.
