Economic bubbles occur when prices trending sharply upward spur positive, rather than negative, feedback.

如果价格急剧上行引起的是正面而非负面反馈，就会产生经济泡沫。

Today's trade grew from tulip mania, the 17th century economic bubble, when tulip bulbs sold for more than a year's wages.

今天的贸易起源于17世纪经济泡沫时期的郁金香热，当时郁金香球茎的售价超过一年的工资。

It’s seen as the first example of an economic bubble.

它被视为经济泡沫的第一个例子。

Throughout the years, there have been all sorts of economic bubbles.

这些年来，经济泡沫层出不穷。

Economists have laid out five stages of an economic bubble.

经济学家列出了经济泡沫的五个阶段。

This is the third stage of an economic bubble: euphoria.

这是经济泡沫的第三阶段：欣快感。

That brings us to the second stage of an economic bubble: a price boom.

这将我们带到了经济泡沫的第二阶段：价格繁荣。

It's when the term millionaire first entered the lexicon and when parts of Europe became engulfed in not one but two economic bubbles in the same year.

那是百万富翁这个词第一次进入词典的时候， 也是欧洲部分地区在同一年被两个而不是一个经济泡沫所吞没的时候。

However, much of this economic expansion was based on speculative investment which created a huge economic bubble, one which burst spectacularly in the autumn of 1929 with the Wall Street Crash.

然而，这种经济扩张很大程度上是建立在投机投资的基础上的， 投机投资创造了巨大的经济泡沫，并于 1929 年秋天随着华尔街崩盘而轰然破裂。