O que é uma bolha de ativos?

Por Pedro Correia

Martin e Ventura respondem a esta pergunta:

"Today’s economies often experience large movements in asset prices that have significant macroeconomic effects. Given that many of these movements in asset prices seem unrelated to economic conditions or fundamentals, they have come to be called bubbles, whether swelling or bursting. Typically, these bubbles are unpredictable and generate substantial macroeconomic effects. Consumption, the capital stock, and output all tend to surge when a bubble arises and then collapse or stagnate when the bubble bursts. "