Focus on the pronunciation of bubble
English definition of “bubble”
/ˈbʌbl/ noun [C] ECONOMICS
› a temporary period when a lot of people invest in a stock, property, or a product that becomes much more expensive than its real value: After the tech bubble burst, few investors were willing to put their money into developing companies.
› a period of great success, which usually ends very suddenly: Economists fear that the economic bubble will pop and lead to a new recession.